Statement of Financial Position [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] SHAREHOLDERS' EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Common stock, no par value (in dollars per share) Common Stock, No Par Value Common stock, authorized (in shares) Common Stock, Shares Authorized Common stock, issued (in shares) Common Stock, Shares, Issued Treasury stock, at cost (in shares) Treasury Stock, Shares Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance at Beginning of Period Stockholders' Equity Attributable to Parent Net income Net Income (Loss) Attributable to Parent Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net tax benefit (deduction) related to share-based compensation Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Share-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Employee savings plan activity Stock Issued During Period, Value, Employee Stock Purchase Plan Dividend paid Dividends, Common Stock, Cash Balance at End of Period Marketable Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Certificates of deposit Certificates of Deposit [Member] U.S. Government securities US Government Agencies Debt Securities [Member] U.S. Government sponsored entities US Government-sponsored Enterprises Debt Securities [Member] Municipal obligations US States and Political Subdivisions Debt Securities [Member] Schedule of Available-for-sale Securities Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Unrealized Gains Available-for-sale Securities, Gross Unrealized Gains Unrealized Losses Available-for-sale Securities, Gross Unrealized Losses Fair Value Available-for-sale Securities, Fair Value Disclosure Commitments and Contingencies Disclosure [Abstract] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Leases, Purchase Price Option [Axis] Leases, Purchase Price Option [Axis] Leases, Purchase Price Option [Axis] Leases, Purchase Price Option [Domain] Leases, Purchase Price Option [Domain] Leases, Purchase Price Option [Domain] January 1, 2015 to December 31, 2016 January 1, 2015 to December 31, 2016 [Member] January 1, 2015 to December 31, 2016 [Member] Year ending December 2017 January 1, 2017 to December 31, 2017 [Member] January 1, 2017 to December 31, 2017 [Member] Year ending December 2018 January 1, 2018 to December 31, 2018 [Member] January 1, 2018 to December 31, 2018 [Member] Operating Leased Assets Operating Leased Assets [Line Items] Operating leases, purchase option price Operating Leases, Purchase Option Price Operating Leases, Purchase Option Price Operating leases, rent expense Operating Leases, Rent Expense, Net Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2014 Operating Leases, Future Minimum Payments, Remainder of Fiscal Year 2015 Operating Leases, Future Minimum Payments, Due in Two Years 2016 Operating Leases, Future Minimum Payments, Due in Three Years 2017 Operating Leases, Future Minimum Payments, Due in Four Years 2018 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Repurchase of equipment guarantees Repurchase of Leased Equipment Guarantee [Member] Repurchase of Leased Equipment Guarantee [Member] Performance guarantees Performance Guarantee [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued expenses Accrued Liabilities [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Letter of credit and bank guarantees agreements Financial Standby Letter of Credit [Member] Surety bonds Surety Bond [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Guarantor Obligations Guarantor Obligations [Line Items] Total Obligations Guarantor Obligations, Maximum Exposure, Undiscounted Guarantees: Guarantees [Abstract] Performance guarantees outstanding Loss Contingency Accrual, at Carrying Value Warranties: Product Warranties Disclosures [Abstract] Standard parts warranty period Product Warranty Accrual, Standard Parts Warranty Coverage Term Product Warranty Accrual, Standard Parts Warranty Coverage Term Installation warranty period Product Warranty Accrual, Installation Warranty Coverage Term Product Warranty Accrual, Installation Warranty Coverage Term Movement in Standard Product Warranty Accrual Movement in Standard Product Warranty Accrual [Roll Forward] Beginning accrued warranty costs Product Warranty Accrual Warranties issued during the period Product Warranty Accrual, Warranties Issued Settlements made during the period Product Warranty Accrual, Payments Changes in accrued warranty costs for pre-existing warranties during the period, including expirations Product Warranty Accrual, Preexisting, Increase (Decrease) Ending accrued warranty costs Guarantor Obligations, Current Carrying Value Guarantor Obligations, Current Carrying Value Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Variable Rate [Axis] Variable Rate [Axis] Information by type of variable rate. Variable Rate [Domain] Variable Rate [Domain] [Domain] for Information by type of variable rate. LIBOR London Interbank Offered Rate (LIBOR) [Member] Interest rate at which a bank borrows funds from other banks in the London interbank market. Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Domestic Line of Credit Domestic Line of Credit [Member] Letter of Credit Letter of Credit [Member] Foreign Line of Credit Foreign Line of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Line of credit facility, unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line of credit facility, amount outstanding Line of Credit Facility, Amount Outstanding Debt instrument, restrictive covenants, fixed charge coverage ratio Debt Instrument, Restrictive Covenants, Fixed Charge Coverage Ratio Debt Instrument, Restrictive Covenants, Fixed Charge Coverage Ratio Debt instrument, restrictive covenants, capital expenditure reserve, amount Debt Instrument, Restrictive Covenants, Capital Expenditure Reserve, Amount Debt Instrument, Restrictive Covenants, Capital Expenditure Reserve, Amount Debt instrument, restrictive covenants, interest-bearing debt, ratio Debt Instrument, Restrictive Covenants, Interest-Bearing Debt, Ratio Debt Instrument, Restrictive Covenants, Interest-Bearing Debt, Ratio Debt instrument, actual, fixed charge coverage ratio Debt Instrument, Actual, Fixed Charge Coverage Ratio Debt Instrument, Actual, Fixed Charge Coverage Ratio Debt instrument, actual, interest-bearing debt, ratio Debt Instrument, Actual, Interest-Bearing Debt, Ratio Debt Instrument, Actual, Interest-Bearing Debt, Ratio Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Cost of goods sold Cost of Sales [Member] Selling Selling Expense [Member] General and administrative General and Administrative Expense [Member] Product design and development Product Design and Development [Member] Product Design and Development [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based compensation expense Allocated Share-based Compensation Expense Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Property, Plant and Equipment [Table] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Buildings Building [Member] Machinery and equipment Machinery and Equipment [Member] Office furniture and equipment Office Furniture and Equipment [Member] Office Furniture and Equipment [Member] Computer software and hardware Computer Software and Hardware [Member] Computer Software and Hardware [Member] Equipment held for rental Equipment Held for Rental [Member] Equipment Held for Rental [Member] Demonstration equipment Demonstration Equipment [Member] Demonstration Equipment [Member] Transportation equipment Transportation Equipment [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Estimated useful life Property, Plant and Equipment, Useful Life Depreciation Depreciation Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Commerical Commerical [Member] Commerical [Member] Live Events Live Events [Member] Live Events [Member] Schools & Theatres Schools and Theatres [Member] Schools and Theatres [Member] Transportation Transportation [Member] Transportation [Member] International International [Member] International [Member] Unallocated corporate depreciation Unallocated Amount to Segment [Member] Segment Reporting Information Segment Reporting Information [Line Items] Number of business units Number of Reportable Segments Net sales Revenue, Net Contribution margin Contribution Margin Contribution Margin Non-allocated operating expenses: Operating Expenses [Abstract] General and administrative General and Administrative Expense Product design and development Research and Development Expense Operating income Operating Income (Loss) Nonoperating income (expense): Nonoperating Income (Expense) [Abstract] Interest income Investment Income, Net Interest expense Interest Expense Other (expense) income, net Other Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Contractors [Abstract] Costs incurred Contract Receivable, Gross (Excluding Aggregate Billings), Costs Incurred Contract Receivable, Gross (Excluding Aggregate Billings), Costs Incurred Estimated earnings Contract Receivable, Gross (Excluding Aggregate Billings) Estimated Profit Contract Receivable, Gross (Excluding Aggregate Billings) Estimated Profit Costs and estimated earnings on uncompleted contracts Contract Receivable, Gross (Excluding Aggregate Billings) Contract Receivable, Gross (Excluding Aggregate Billings) Less billings to date Contract Receivable, Aggregate Billings Contract Receivable, Aggregate Billings Costs in excess of billings, net Costs in Excess of Billings on Uncompleted Contracts or Programs Schedule of Nonvested Restricted Stock and Restricted Stock Units Activity Schedule of Nonvested Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Nonvested Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Stock Option Award Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Weighted-Average Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-Based Compensation Expense by Award Type Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Share-Based Compensation Expense Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Valuation and Qualifying Accounts [Abstract] SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Income Statement [Abstract] Cost of goods sold Cost of Revenue Gross profit Gross Profit Operating expenses: Selling expense Selling Expense Total operating expenses Operating Expenses Operating income Income before income taxes Net income Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Earnings per share: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Cash dividend declared per share Common Stock, Dividends, Per Share, Declared Selected Financial Statement Data [Abstract] Selected Financial Statement Data [Abstract] Foreign currency transaction gains (losses) Foreign Currency Transaction Gain (Loss), before Tax Equity in losses of affiliates Income (Loss) from Equity Method Investments Other Other Nonoperating Income Other (expense) income, net Net sales: Geographic Areas, Revenues from External Customers [Abstract] United States Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile Outside U.S. Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries Net sales Long-lived assets: Geographic Areas, Long-Lived Assets [Abstract] United States Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile Outside U.S. Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries Long-lived assets Long-Lived Assets Fair Value Disclosures [Abstract] Fair Value Measurement Fair Value Disclosures [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Schedule of Other (Expense) Income Schedule of Other Nonoperating Income (Expense) [Table Text Block] Selected Financial Statement Data Additional Financial Information Disclosure [Text Block] Supplemental Cash Flow Information [Abstract] (Increase) decrease: Increase (Decrease) in Operating Assets [Abstract] Restricted cash Increase (Decrease) in Restricted Cash for Operating Activities Accounts receivable Increase (Decrease) in Accounts Receivable Long-term receivables Increase (Decrease) in Long-term Receivables, Current Inventories Increase (Decrease) in Inventories Costs and estimated earnings in excess of billings Increase (Decrease) in Costs in Excess of Billings Increase (Decrease) in Costs in Excess of Billings Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Income taxes receivable Increase (Decrease) in Income Taxes Receivable Advertising rights and other assets Increase (Decrease) in Advertising Rights and Other Assets Increase (Decrease) in Advertising Rights and Other Assets Increase (decrease): Increase (Decrease) in Operating Liabilities [Abstract] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Customer deposits Increase (Decrease) in Customer Deposits Billings in excess of costs and estimated earnings Increase (Decrease) in Billing in Excess of Cost of Earnings Long-term warranty obligations Increase (Decrease) In Long-Term Warranty Obligation Increase (Decrease) In Long-Term Warranty Obligation Income taxes payable Increase (Decrease) in Income Taxes Payable Long-term deferred revenue Increase (Decrease) in Deferred Revenue Other long-term obligations Increase (Decrease) in Other Operating Liabilities Change in operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Current: Current Income Tax Expense (Benefit) [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Deferred taxes Deferred Income Tax Expense (Benefit) Income tax expense Compensation Employee-related Liabilities, Current Taxes, other than income taxes Accrual for Taxes Other than Income Taxes, Current Other Other Accrued Liabilities, Current Accrued expenses Accrued Liabilities, Current Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts Allowance for Doubtful Accounts [Member] Allowance for Excess and Obsolete Inventories Inventory Valuation Reserve [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Balance at Beginning of Year Valuation Allowances and Reserves, Balance Charged to Costs and Expenses Valuation Allowances and Reserves, Charged to Cost and Expense Charged to Other Accounts Valuation Allowances and Reserves, Charged to Other Accounts Deductions Valuation Allowances and Reserves, Deductions Balance at End of Year Raw materials Inventory, Raw Materials, Net of Reserves Work-in-process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Inventories Inventory, Net Inventory allowance Inventory Valuation Reserves Quarterly Financial Information Disclosure [Abstract] Schedule of Quarterly Financial Data Schedule of Quarterly Financial Information [Table Text Block] Shareholders' Equity and Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Summary of Changes in Operating Assets and Liabilities Cash Flow, Operating Capital [Table Text Block] Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Non-Cash Investing and Financing Activities Schedule of Other Significant Noncash Transactions [Table Text Block] Less than 12 months Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Greater than 12 months Available-for-sale Securities, Debt Maturities, After One Year, Fair Value Available-for-sale Securities, Debt Maturities, After One Year, Fair Value Total Available-for-sale Securities, Debt Securities Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Amendment Flag Document Period End Date Document Period End Date Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Nature of business Nature of Operations [Text Block] Fiscal year Fiscal Period, Policy [Policy Text Block] Principles of consolidation Consolidation, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Restricted cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Revenue recognition Revenue Recognition, Policy [Policy Text Block] Revenue recognition - Long-term construction-type contracts Revenue Recognition, Long-term Contracts [Policy Text Block] Revenue recognition - Equipment other than construction-type contracts Revenue Recognition, Sales of Goods [Policy Text Block] Revenue recognition - Product maintenance Revenue Recognition, Deferred Revenue [Policy Text Block] Revenue recognition - Services Revenue Recognition, Sales of Services [Policy Text Block] Revenue recognition - Multiple-element arrangements Revenue Recognition, Multiple-deliverable Arrangements, Description [Policy Text Block] Revenue recognition - Software Revenue Recognition, Software [Policy Text Block] Revenue recognition - Long-term receivables and advertising rights Revenue Recognition, Long-term Receivables and Advertising Rights [Policy Text Block] Revenue Recognition, Long-term Receivables and Advertising Rights [Policy Text Block] Property and equipment Property, Plant and Equipment, Policy [Policy Text Block] Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Software costs Internal Use Software, Policy [Policy Text Block] Foreign currency translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Income taxes Income Tax, Policy [Policy Text Block] Comprehensive income (loss) Comprehensive Income, Policy [Policy Text Block] Product design and development Research and Development Expense, Policy [Policy Text Block] Advertising costs Advertising Costs, Policy [Policy Text Block] Shipping and handling cost Shipping and Handling Cost, Policy [Policy Text Block] Earnings per share (EPS) Earnings Per Share, Policy [Policy Text Block] Share-based compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Research tax credits Income Tax Reconciliation, Tax Credits, Research Change in foreign deferred rates Income Tax Reconciliation, Foreign Income Tax Rate Differential Interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Accrued interest or penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Uncompleted Contracts Long-term Contracts or Programs Disclosure [Text Block] Noncontrolling Interest [Abstract] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Outcast Affiliated Entity [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Income Other Income [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Ownership percentage Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Equity Method Investments Equity Method Investments Gain from deconsolidation Deconsolidation, Gain (Loss), Amount Compensation and Retirement Disclosure [Abstract] Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Supplemental Cash Flow Elements [Abstract] Cash payments for: Interest Interest Paid Income taxes, net of refunds Income Taxes Paid, Net Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Table Text Block] Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Table Text Block] Schedule of Components of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Pretax Income Domestic and Foreign Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Current and Non Current Schedule of Deferred Tax Assets and Liabilities Current and Non Current [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Current and Non Current [Table Text Block] Reconciliation of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents, Current Marketable securities Available-for-sale Securities, Current Accounts receivable, net Accounts Receivable, Net, Current Inventories, net Costs and estimated earnings in excess of billings Costs in Excess of Billings on Uncompleted Contracts or Programs Expected to be Collected within One Year Current maturities of long-term receivables Notes, Loans and Financing Receivable, Net, Current Prepaid expenses and other assets Prepaid Expense and Other Assets, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Income tax receivables Income Taxes Receivable, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Long-term receivables, less current maturities Notes, Loans and Financing Receivable, Net, Noncurrent Goodwill Goodwill Intangibles, net Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets, Net Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets, Net Advertising rights, net and other assets Advertising Rights, Net and Other Cost of equipment is recorded as advertising rights where advertising agreements have not sold for the full value of the equipment at normal margins, reported on the balance sheet as noncurrent assets, and other assets not otherwise specified in the taxonomy. Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Noncurrent TOTAL ASSETS Assets CURRENT LIABILITIES: Liabilities, Current [Abstract] Notes payable, bank Short-term Bank Loans and Notes Payable Accounts payable Accounts Payable, Current Accrued expenses Warranty obligations Product Warranty Accrual, Current Billings in excess of costs and estimated earnings Billings in Excess of Cost, Current Customer deposits (billed or collected) Customer Deposits, Current Deferred revenue (billed or collected) Deferred Revenue, Current Current portion of other long-term obligations Other Long-term Debt, Current Income taxes payable Accrued Income Taxes, Current Deferred income taxes Deferred Tax Liabilities, Net, Current Total current liabilities Liabilities, Current Long-term warranty obligations Product Warranty Accrual, Noncurrent Long-term deferred revenue (billed or collected) Deferred Revenue, Noncurrent Other long-term obligations, less current maturities Other Liabilities, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Total long-term liabilities Liabilities, Noncurrent Common stock, no par value, authorized 120,000,000 shares; 42,393,456 and 41,930,116 shares issued at April 27, 2013 and April 28, 2012, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Treasury stock, at cost, 19,680 shares Treasury Stock, Value Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income (Loss), Net of Tax TOTAL SHAREHOLDERS' EQUITY TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Cost method investee, carrying balance Cost Method Investments Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Percentage of matching contribution Defined Contribution Plan, Employer Matching Contribution, Percent Maximum annual contribution percentage Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent Award requisite service period Defined Contribution Plan, Award Requisite Service Period Defined Contribution Plan, Award Requisite Service Period Minimum age attained for award Defined Contribution Plan, Attained Age Defined Contribution Plan, Attained Age Minimum hours worked Defined Contribution Plan, Hours Worked Defined Contribution Plan, Hours Worked Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Title of Individual [Axis] Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Title of Individual with Relationship to Entity [Domain] Officers and Former Director Officers and Former Director [Member] Officers and Former Director [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Contributions Defined Contribution Plan, Cost Recognized Contribution plan, accrued interest Defined Contribution Plan, Accrued Interest Defined Contribution Plan, Accrued Interest Lump sum distribution period, option one Defined Contribution Plan, Distribution Period One Defined Contribution Plan, Distribution Period One Lump sum distribution period, option two Defined Contribution Plan, Distribution Period Two Defined Contribution Plan, Distribution Period Two Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Stock Options Stock Options [Member] Restricted Stock and Restricted Stock Units Restricted Stock and Restricted Stock Units [Member] Restricted Stock and Restricted Stock Units [Member] Employee Stock Employee Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based compensation Share-based Compensation Deferred taxes assets: Components of Deferred Tax Assets [Abstract] Warranty reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Vacation accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Net losses on equity investments Deferred Tax Assets, Equity Method Investments Deferred maintenance revenue Deferred Tax Assets, Deferred Income Reserves for excess and obsolete inventory Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Equity compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Allowance for doubtful accounts Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Inventory capitalization Deferred Tax Assets, Inventory Accrued compensation and benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other Intangible assets Deferred Tax Assets, Goodwill and Intangible Assets Net operating loss carry forwards Deferred Tax Assets, Operating Loss Carryforwards Other Deferred Tax Assets, Other Deferred tax assets, gross Deferred Tax Assets, Gross Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Other Deferred Tax Liabilities, Other Deferred tax liabilities, gross Deferred Tax Liabilities, Gross Deferred tax assets, net Deferred Tax Assets, Net Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Undesignated Stock Undesignated Stock [Member] Undesignated Stock [Member] Independent Directors Director [Member] Restricted Stock Restricted Stock [Member] In The Money Options In The Money Options [Member] In The Money Options [Member] Shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Common purchase right per common stock Common Share Purchase Right Per Common Share, Ratio Common Share Purchase Right Per Common Share, Ratio Conversion ratio for rights to common stock Conversion of Stock, Shares Converted Share price Share Price Days following ownership announcement option one Common Share Rights Exercise, Period, Option One Common Share Rights Exercise, Period, Option One Percentage of ownership Sale of Stock, Percentage of Ownership after Transaction Days following ownership announcement, option two Common Share Rights Exercise, Period, Option Two Common Share Rights Exercise, Period, Option Two Award life Share-based Compensation Arrangement by Share-based Payment Award Expiration Period Share-based Compensation Arrangement by Share-based Payment Award Expiration Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Unrecognized compensation costs Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options Weighted-average period for unrecognized costs Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Exercise price (usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Exercisable at end of year, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercised, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Fair value of vested options Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Requisite service period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Employee maximum contribution percentage Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Percentage of purchase price at the lower of the fair market value Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date Purchase discount percentage Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Stock issued for ESPP Stock Issued During Period, Shares, Employee Stock Purchase Plans Shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Nonvested unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Proceeds from exercise of stock options Proceeds from Stock Options Exercised Tax benefit from share based payments Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Statement of Other Comprehensive Income [Abstract] Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Cumulative translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Unrealized (loss) gain on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Total other comprehensive (loss) income, net of tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Sales returns, reserve Revenue Recognition, Sales Returns, Reserve for Sales Returns Deferred revenue period for recognition of product maintenance contracts Revenue Recognition, Period of Deferred Revenue Recognition Revenue Recognition, Period of Deferred Revenue Recognition Percentage of net sales from services Sales Revenue, Services, Net, Percentage The percentage of net service revenue to total net revenue from the sale of services as of year end. Cost of advertising net of amortization Advertising Barter Transactions, Advertising Barter Costs Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Gross profit Basic earnings per share (in dollars per share) Diluted earnings per share (in dollars per share) Fair value of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividend rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected life of option Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Cash dividend declared (usd per share) Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Table] Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Table] Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Patents Patents [Member] Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items] Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items] [Line Items] for Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Table] Definite-lived, Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Definite-lived, Net Value Finite-Lived Intangible Assets, Net Indefinite-lived assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Definite-lived and Indefinite lived, Gross Carrying Amount Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets, Gross Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Basis Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Total Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Restricted cash Restricted Cash and Cash Equivalents, Fair Value Disclosure Restricted Cash and Cash Equivalents, Fair Value Disclosure Available-for-sale securities: Derivatives - currency forward contracts Foreign Currency Contracts, Liability, Fair Value Disclosure Assets, net Assets (Liabilities), Net, Fair Value Disclosure Assets (Liabilities), Net, Fair Value Disclosure Estimated amortization, 2014 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Estimated amortization, 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Two Estimated amortization, 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated amortization, 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Four Asset impairment charges Asset Impairment Charges Costs and estimated earnings in excess of billings Billings in excess of costs and estimated earnings Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill Goodwill [Line Items] Goodwill Goodwill [Roll Forward] Balance as of April 28, 2012: Foreign currency translation Goodwill, Translation Adjustments Balance as of April 27, 2013: Net income Net Income (Loss) Attributable to Parent [Abstract] Basic earnings per share Dilution associated with stock compensation plans Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units Diluted earnings per share Net Income (Loss) Available to Common Stockholders, Diluted Shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic earnings per share (in shares) Dilution associated with stock compensation plans (in shares) Incremental Common Shares Attributable to Share-based Payment Arrangements Diluted earnings per share (in shares) Per share income (loss) Earnings Per Share Reconciliation [Abstract] Dilution associated with stock compensation plans (in dollars per share) Incremental Common Shares Attributable to Share-based Payment Arrangements, Per Share Amount Incremental Common Shares Attributable to Share-based Payment Arrangements, Per Share Amount Diluted earnings per share (in dollars per share) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share) Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price Summary of Uncompleted Contracts Schedule of Uncompleted Contracts [Table Text Block] Schedule of Uncompleted Contracts [Table Text Block] Costs in Excess of Billings Costs in Excess of Billings and Billings in Excess of Costs [Table Text Block] Tabular disclosure for billings on uncompleted contracts in excess of costs and costs of uncompleted contracts in excess of billings. Number of Nonvested Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding at beginning of year, Nonvested Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted, Nonvested Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested, Nonvested Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited, Nonvested Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding at end of year, Nonvested Shares Weighted Average Grant Date Fair Value Per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Outstanding at beginning of year, Weighted Average Grant Date Fair Value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted Average Grant Date Fair Value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited, Weighted Average Grant Date Fair Value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding at end of year, Weighted Average Grant Date Fair Value (usd per share) Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Tax Holiday [Table] Income Tax Holiday [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] CHINA CHINA Income Tax Holiday [Line Items] Income Tax Holiday [Line Items] Income tax holiday, benefit Income Tax Holiday, Aggregate Dollar Amount Income tax holiday, benefit per share (in usd per share) Income Tax Holiday, Income Tax Benefits Per Share Computed income tax expense at federal statutory rate Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate State taxes, net of federal benefit Income Tax Reconciliation, State and Local Income Taxes Research and development tax credit Meals and entertainment Income Tax Reconciliation, Nondeductible Expense, Meals and Entertainment Stock compensation Income Tax Reconciliation, Nondeductible Expense, Share-based Compensation Cost Dividends paid to retirement plan Income Tax Rate Reconciliation, Deductions, Employee Stock Ownership Plan Dividends Domestic production activities deduction Income Tax Reconciliation, Deductions, Qualified Production Activities Change in foreign deferred rates Reversal of valuation allowance Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance Other, net Income Tax Reconciliation, Other Adjustments Effective income tax expense Income Tax Expense (Benefit), Continuing Operations Segment Reporting Segment Reporting Disclosure [Text Block] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Advertising expense Advertising Expense Current assets Deferred Tax Assets, Net, Current Current liabilities Non-current assets Deferred Tax Assets, Net, Noncurrent Non-current liabilities Land Land [Member] Property and equipment, gross Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at beginning of year, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Canceled or forfeited, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Exercised, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Outstanding at end of year, Shares Shares vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Weighted Average Exercise Price Per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Outstanding at beginning of year, (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, (usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Canceled or forfeited, (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Exercised, (usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Outstanding at end of year, (usd per share) Shares vested and expected to vest (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Exercisable at end of year (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Outstanding, beginning of period, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Outstanding, end of period, weighted average remaining contractual life Vested and expected to vest, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable at end of period, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Outstanding, beginning of period, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Outstanding, end of period, aggregate intrinsic value Shares vested and expected to vest, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable at end of period, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Receivables [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable Type [Domain] Receivable Type [Domain] Financing Receivable Financing Receivable [Member] Receivables Accounts, Notes, Loans and Financing Receivable [Line Items] Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Long-term contracts and lease receivables, present value Financing Receivable, Net Contract and lease receivables annual interest rates Loans and Leases Receivable, Interest Rate Loans and Leases Receivable, Interest Rate Long-term contracts and lease receivables, face amount Financing Receivable, Gross Retainage on construction-type contracts, expected to be collected in one year Contract Receivable Retainage, Due in Next Twelve Months Schedule of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Long-term Purchase Commitment Long-term Purchase Commitment [Table Text Block] Investments in Affiliates and Related Party Transactions Noncontrolling Interest Disclosure [Text Block] Financing Agreements Debt Disclosure [Text Block] Receivables Financing Receivables [Text Block] Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Amortization Amortization Amortization of premium/discount on marketable securities Accretion (Amortization) of Discounts and Premiums, Investments Loss (gain) on sale of property and equipment Gain (Loss) on Sale of Property Plant Equipment Excess tax benefits from share-based compensation Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities Equity in losses of affiliates Provision for doubtful accounts Provision for Doubtful Accounts Deferred income taxes, net Change in operating assets and liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Purchases of marketable securities Payments to Acquire Marketable Securities Proceeds from sales or maturities of marketable securities Proceeds from Sale and Maturity of Marketable Securities Insurance recoveries on property and equipment Proceeds from Insurance Settlement, Investing Activities Other investing activities, net Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings on notes payable Proceeds from Lines of Credit Payments on notes payable Repayments of Notes Payable Excess tax benefits from share-based compensation Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities Principal payments on long-term obligations Repayments of Long-term Debt Dividends paid Payments of Ordinary Dividends, Common Stock Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities EFFECT OF EXCHANGE RATE CHANGES ON CASH Effect of Exchange Rate on Cash and Cash Equivalents NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS: Cash and Cash Equivalents [Abstract] Beginning of period End of period Available-for-sale Securities Available-for-sale Securities [Table Text Block] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Earnings Per Share Reconciliation Schedule of Earnings Per Share Reconciliation [Table Text Block] Nature of Business and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Demonstration equipment transferred to inventory Demonstration equipment transferred to inventory Value of demonstration equipment transferred to inventory in noncash transaction during the reporting period. Purchases of property and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Contributions of common stock under the employee stock purchase plan Stock Issued Conditional purchase commitment Conditional Purchase Commitment, Amount Conditional Purchase Commitment, Amount Purchase Obligation, Fiscal Year Maturity Purchase Obligation, Fiscal Year Maturity [Abstract] 2014 Purchase Obligation, Due in Next Twelve Months 2015 Purchase Obligation, Due in Second Year 2016 Purchase Obligation, Due in Third Year 2017 Purchase Obligation, Due in Fourth Year 2018 Purchase Obligation, Due in Fifth Year Thereafter Purchase Obligation, Due after Fifth Year Total Purchase Obligation Self-insurance liability Self Insurance Liability Self Insurance Liability Schedule of Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Reconciliation of Changes in Unrecognized Tax Benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits, beginning balance Unrecognized Tax Benefits Gross increases related to prior period tax positions Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions Gross decreases related to prior period tax positions Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions Gross increases related to current period tax positions Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions Lapse of statute of limitations Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations Unrecognized tax benefits, ending balance Derivative [Table] Derivative [Table] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] U.S. Dollars/Australian Dollars USD to AUD [Member] USD to AUD [Member] U.S. Dollars/Canadian Dollars USD to CAD [Member] USD to CAD [Member] U.S. Dollars/British Pounds USD to GBP [Member] [Member] USD to GBP [Member] [Member] U.S. Dollars/Euros USD to EUR [Member] USD to EUR [Member] U.S. Dollars/Singapore Dollars USD to SGD [Member] USD to SGD [Member] U.S. Dollars/Brazilian Reais USD to BRL [Member] USD to BRL [Member] Derivative Derivative [Line Items] Foreign Currency Exchange Forward Contracts: Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Fair value of foreign currency exchange forward contracts Long-Lived Assets Goodwill and Intangible Assets Disclosure [Text Block]