Treasury stock, shares (in shares) Treasury Stock, Shares Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in usd per share) Antidilutive Securities Excluded from Computation of Earnings Per Share Weighted Average Exercise Price The weighted average exercise price of antidilutive securities. Provision (recovery) for doubtful accounts, net Accounts Receivable, Credit Loss Expense (Reversal) Income tax expense (benefit) Income Tax Expense (Benefit) Geographical [Domain] Geographical [Domain] Deferred income taxes Deferred Income Tax Liabilities, Net Deferred income taxes Deferred Income Tax Assets, Net Schedule of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Income Statement [Abstract] Income Statement [Abstract] Financial Standby Letter of Credit Financial Standby Letter of Credit [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Additional Paid-In Capital Additional Paid-in Capital [Member] Document Fiscal Period Focus Document Fiscal Period Focus Per share (loss) income Earnings Per Share, Basic [Abstract] Diluted (in shares) Diluted earnings per share, shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Debt Instrument [Axis] Debt Instrument [Axis] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Live Events Live Events Segment [Member] Represents the live events segment. Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Income Tax Disclosure [Abstract] Common Stock, no par value, authorized 115,000,000 shares; 47,373,959 and 46,733,544 shares issued at January 28, 2023 and April 30, 2022, respectively Common Stock, Value, Issued Investments in Affiliates Investment [Text Block] Additional paid-in capital Additional Paid in Capital Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] XdisplayTM XdisplayTM [Member] XdisplayTM Preferred Stock Preferred Stock [Member] Warranties issued during the period Standard and Extended Product Warranty Accrual, Increase for Warranties Issued Financial Instruments [Domain] Financial Instruments [Domain] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Operating segments Operating Segments [Member] Convertible Debt Convertible Debt [Member] 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] Proceeds from sales or maturities of marketable securities Proceeds from Sale and Maturity of Marketable Securities Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Property and equipment, net of accumulated depreciation: Long-Lived Assets Beginning of period End of period Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cumulative translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] CURRENT LIABILITIES: Liabilities, Current [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Proceed from exercise of stock options Proceeds from Stock Options Exercised Fair value, net asset (liability), total Fair Value, Net Asset (Liability) Common stock, shares, issued (in shares) Common Stock, Shares, Issued Derivatives - liability position Foreign Currency Contracts, Liability, Fair Value Disclosure Treasury stock purchase Treasury Stock, Value, Acquired, Cost Method Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Equity method investments Equity Method Investments Net income (loss) Net income (loss) Basic earnings per share Net Income (Loss) Attributable to Parent Contract liabilities Contract liabilities - current Contract with Customer, Liability, Current Current maturities of long-term receivables Financing Receivable, after Allowance for Credit Loss, Current Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Purchases of property and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Document Information [Line Items] Document Information [Line Items] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Goods/services transferred over time Transferred over Time [Member] Income Statement Location [Domain] Income Statement Location [Domain] Equity Component [Domain] Equity Component [Domain] Amendment Flag Amendment Flag Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Subsequent Event Type [Domain] Subsequent Event Type [Domain] Employee savings plan activity Stock Issued During Period, Value, Employee Stock Purchase Plan Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Restricted cash Restricted Cash And Cash Equivalents, Fair Value Disclosure The fair value portion of restricted cash and cash equivalents. Investment, Name [Domain] Investment, Name [Domain] Schedule of Segment Reporting Information, By Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Goodwill and Intangible Assets Disclosure [Abstract] Standby letters of credit Standby Letters of Credit [Member] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Depreciation and amortization: Depreciation, Depletion and Amortization Disaggregation of Revenue Table Disaggregation of Revenue [Table] Available-for-sale securities: Debt Securities, Available-for-Sale, Excluding Accrued Interest Payments on notes payable Repayments of Notes Payable Surety Bond Surety Bond [Member] Goodwill [Line Items] Goodwill [Line Items] Percent Change Percent Change [Abstract] Percent Change Total long-term liabilities Liabilities, Noncurrent Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Long-term line of credit Long-Term Line of Credit Entity Address, State or Province Entity Address, State or Province Level 1 Fair Value, Inputs, Level 1 [Member] Treasury stock reissued Stock Issued During Period, Value, Treasury Stock Reissued Other comprehensive (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Long-term warranty obligations Product Warranty Accrual, Noncurrent Dollar Change Dollar Change [Abstract] Dollar Change Changes in Unearned Service-Type Warranty Contract [Roll Forward] Changes in Unearned Service-Type Warranty Contract [Roll Forward] Changes in Unearned Service-Type Warranty Contract Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Basis of Accounting Basis of Accounting, Policy [Policy Text Block] EFFECT OF EXCHANGE RATE CHANGES ON CASH Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Property and equipment, net Property, Plant and Equipment, Net Product Design and Development Product Design and Development [Member] Represents product design and development information. Depreciation and amortization Depreciation, Amortization and Accretion, Net Adjustments to reconcile net (loss) income to net cash used in operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Principal payments on long-term obligations Repayments of Long-Term Debt Treasury Stock, at cost, 1,907,445 shares at January 28, 2023 and April 30, 2022, respectively Treasury Stock, Value Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Other expense, net Other expense, net Other Nonoperating Income (Expense) Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Unrealized gain (loss) on available-for-sale securities, net of tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax International International Segment [Member] Represents the international segment. Common stock, shares authorized (in shares) Common Stock, Shares Authorized Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Income taxes payable Accrued Income Taxes, Current Geographical [Axis] Geographical [Axis] Operating expenses Operating expenses: Operating Expenses CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Settlements made during the period Standard and Extended Product Warranty Accrual, Decrease for Payments Guarantee of Business Revenue Guarantee of Business Revenue [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Total current assets Assets, Current Marketable securities Debt Securities, Available-for-Sale, Current Income taxes, net of refunds Income Taxes Paid, Net Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Document Type Document Type Unique configuration Unique Configuration [Member] Represents the unique configuration. Recognized revenue Contract with Customer, Liability, Revenue Recognized Goods/services transferred at a point in time Transferred at Point in Time [Member] Entity Small Business Entity Small Business Measurement Frequency [Domain] Measurement Frequency [Domain] Intangibles, net Finite-Lived Intangible Assets, Net Line of Credit Facility [Table] Line of Credit Facility [Table] Revenue, remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Segments [Axis] Segments [Axis] Financing Agreements Debt Disclosure [Text Block] Product and Service [Domain] Product and Service [Domain] Entity Shell Company Entity Shell Company Deferred income taxes, net Deferred Income Tax Expense (Benefit) Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Title of 12(b) Security Title of 12(b) Security Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Consolidation Items [Domain] Consolidation Items [Domain] Subsequent Event Subsequent Event [Member] Contract with Customer, Contract Asset, Contract Liability, and Receivable Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Document Period End Date Document Period End Date Warranty obligations Product Warranty Accrual, Current US Government securities US Government Agencies Debt Securities [Member] TOTAL ASSETS Assets Segment Reporting Segment Reporting Disclosure [Text Block] Debt Disclosure [Abstract] Earnings (loss) per share: Earnings Per Share [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Accrued expenses Accrued Liabilities, Current Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Line of credit, temporary expansion amount Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Foreign currency translation and other Contract with Customer, Liability, Increase (Decrease) for Foreign Currency Translation and Other Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from foreign currency translation and other. Inventories Inventory, Net Purchase of convertible notes Convertible Notes Payable Line of Credit Line of Credit [Member] Accounts payable Accounts Payable, Current Income (loss) before income taxes Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest SHAREHOLDERS' EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Segments [Domain] Segments [Domain] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Earnings Per Share ("EPS") Earnings Per Share [Text Block] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Entity Filer Category Entity Filer Category Basic (in shares) Basic earnings per share, shares (in shares) Weighted Average Number of Shares Outstanding, Basic United States UNITED STATES Loss contingency accrual Loss Contingency Accrual Income tax receivables Income Taxes Receivable, Current Cash and cash equivalents denominated in U.S. dollars Cash, Not Held in Foreign Currency Ownership percentage Equity Method Investment, Ownership Percentage Gross profit Gross profit: Gross Profit Supplemental schedule of non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Security Exchange Name Security Exchange Name Entity Registrant Name Entity Registrant Name Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Contributions of common stock under the ESPP Stock Issued Preferred Shares, no par value, authorized 50,000 shares; no shares issued and outstanding Preferred Stock, Value, Issued Line of Credit Long-Term Line of Credit, Noncurrent Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Net sales Revenue from Contract with Customer, Excluding Assessed Tax Entity Address, City or Town Entity Address, City or Town Operating expenses: Operating Expenses [Abstract] Level 3 Fair Value, Inputs, Level 3 [Member] New contracts sold Contract With Customer, Liability, New Contracts Sold Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from new contract sold. Goodwill impairment Goodwill impairment Goodwill, Impairment Loss Contract assets Contract Assets, Percent Change The percent change of contract assets. Revenue Recognition Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Restricted cash Restricted cash Restricted Cash and Cash Equivalents, Current Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Contract assets Increase (Decrease) in Contract with Customer, Asset Contract liabilities - current Increase (Decrease) in Contract with Customer Liability, Current Amount of increase (decrease) in current contract with customer liability. Commitments and Contingencies Disclosure [Abstract] Investment, Name [Axis] Investment, Name [Axis] Fair Value Measurement Fair Value Disclosures [Text Block] Additional cash balances denominated in foreign currencies, maintained by foreign subsidiaries Cash, Additional Amount Held In Foreign Currencies, Maintained By Foreign Subsidiaries Cash, Additional Amount Held In Foreign Currencies, Maintained By Foreign Subsidiaries Credit Facility Due April 2025 Credit Facility Due April 2025 [Member] Credit Facility Due April 2025 Tax payments related to RSU issuances Payment, Tax Withholding, Share-Based Payment Arrangement TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity Trading Symbol Trading Symbol Entity File Number Entity File Number Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Goodwill [Roll Forward] Goodwill [Roll Forward] Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Long-term contract liabilities Contract liabilities - noncurrent Contract with Customer, Liability, Noncurrent Service-type Warranty Contracts Service-type Warranty Contracts [Member] Represents the service-type warranty contracts. Dilution associated with stock compensation plans, shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Product design and development Product design and development Research and Development Expense Outside United States Non-US [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Tax rate Effective Income Tax Rate Reconciliation, Percent Current Fiscal Year End Date Current Fiscal Year End Date Long-term receivables, less current maturities Financing Receivable, after Allowance for Credit Loss, Noncurrent Diluted earnings per share Net Income (Loss) Available to Common Stockholders, Diluted Diluted (in usd per share) Diluted earnings per share, per share income (in usd per share) Earnings Per Share, Diluted Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Proceeds from sales of property, equipment and other assets Proceeds from Sale of Property, Plant, and Equipment Contract liabilities - noncurrent Contract Liabilities Noncurrent, Percent Change The percent change of noncurrent contract liabilities. Gain on sale of property, equipment and other assets Gain (Loss) on Disposition of Property Plant Equipment Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Consolidation Items [Axis] Consolidation Items [Axis] Total current liabilities Liabilities, Current Beginning accrued warranty obligations Ending accrued warranty obligations Standard and Extended Product Warranty Accrual Miortech Miortech [Member] Miortech Interest (expense) income, net Interest (expense) income, net Investment Income, Net Income Taxes Income Tax Disclosure [Text Block] Credit Facility [Domain] Credit Facility [Domain] High School Park and Recreation High School Park and Recreation Segment [Member] Represents the high school park and recreation segment. Accounts payable Accounts Payable Schedule of Goodwill Schedule of Goodwill [Table Text Block] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Basic (in usd per share) Basic earnings per share, per share income (in usd per share) Earnings Per Share, Basic Unrecognized tax benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Revenue, remaining performance obligation Revenue, Remaining Performance Obligation, Amount Nonoperating (expense) income: Nonoperating Income (Expense) [Abstract] Service and other Service and Other [Member] Represents the service and other. Commercial Commercial Segment [Member] Represents the commercial segment. Corporate, non-segment Corporate, Non-Segment [Member] Shares Earnings Per Share, Basic, Other Disclosure [Abstract] Entity Address, Address Line One Entity Address, Address Line One Selling Selling Selling Expense Cost of sales Cost of Revenue Balance at beginning of period Balance at ending of period Contract with Customer, Liability Credit Facility Due May 2023 Credit Facility Due May 2023 [Member] Credit Facility Due May 2023 Treasury Stock Treasury Stock [Member] TOTAL SHAREHOLDERS' EQUITY Balance beginning Balance ending Stockholders' Equity Attributable to Parent Product and Service [Axis] Product and Service [Axis] Class of Stock [Domain] Class of Stock [Domain] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Fair Value Disclosures [Abstract] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Less: reductions for revenue recognized Contract with Customer Liability Revenue Recognized During Period Amount of revenue recognized during period including amounts previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.) Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Entity Interactive Data Current Entity Interactive Data Current Limited configuration Limited Configuration [Member] Represents limited configuration. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Credit Facility [Axis] Credit Facility [Axis] US Government sponsored entities US Government-sponsored Enterprises Debt Securities [Member] Contract liabilities - noncurrent Increase (Decrease) in Contract with Customer Liability, Noncurrent Amount of increase (decrease) in noncurrent contract with customer liability. Net income (loss) Net Income (Loss) Attributable to Parent [Abstract] Related party transaction, amounts of transaction Related Party Transaction, Amounts of Transaction Contract liabilities - current Contract Liabilities Current, Percent Change The percentage change of current contract liabilities. CASH, CASH EQUIVALENTS AND RESTRICTED CASH: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Retained Earnings Retained Earnings [Member] Entity Tax Identification Number Entity Tax Identification Number Schedule of Investments [Table] Schedule of Investments [Table] Derivatives - asset position Foreign Currency Contract, Asset, Fair Value Disclosure Common Stock Common Stock [Member] Total other comprehensive (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Number of reportable segments Number of Reportable Segments Payments for common shares repurchased Payments for Repurchase of Common Stock Class of Stock [Axis] Class of Stock [Axis] Statement [Table] Statement [Table] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Dilution associated with stock compensation plans (in usd 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 Revenue from Contract with Customer [Abstract] Borrowings on notes payable Proceeds from Notes Payable Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Document Quarterly Report Document Quarterly Report Letter of credit Letter of Credit [Member] CURRENT ASSETS: Assets, Current [Abstract] Demonstration equipment transferred to inventory Demonstration equipment transferred to inventory Amount of demonstration equipment transferred to inventory in noncash or part noncash transactions. NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Retained earnings Retained Earnings (Accumulated Deficit) Promissory Notes Commercial Paper [Member] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Purchases of marketable securities Payments to Acquire Marketable Securities Entity Central Index Key Entity Central Index Key Equity Components [Axis] Equity Components [Axis] Investment in affiliates and other assets Investments and Other Noncurrent Assets Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Recurring Fair Value, Recurring [Member] Tax payments related to RSU issuances Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Document Fiscal Year Focus Document Fiscal Year Focus CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] City Area Code City Area Code Statement [Line Items] Statement [Line Items] General and administrative General and administrative General and Administrative Expense ASSETS Assets [Abstract] Change in operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Transportation Transportation Segment [Member] Represents the transportation segment. Loss Contingencies [Table] Loss Contingencies [Table] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Product Product [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Share-based compensation Share-Based Payment Arrangement, Noncash Expense Additional cash balances denominated in foreign currencies Cash, Additional Amount Held in Foreign Currency Cash, Additional Amount Held in Foreign Currency Purchases of equity and loans to equity investees Amount invested Payments to Acquire Equity Method Investments Cash paid for: Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract] Other long-term obligations Other Liabilities, Noncurrent Equity in loss of affiliates Equity in loss of affiliate Income (Loss) from Equity Method Investments Document Transition Report Document Transition Report Local Phone Number Local Phone Number Dilution associated with stock compensation plans Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Debt conversion, converted instrument, amount Debt Conversion, Converted Instrument, Amount Operating income (loss) Operating income (loss) Operating Income (Loss) Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Document Information [Table] Document Information [Table] Service Service [Member] Goodwill Beginning balance Ending balance Goodwill Changes in accrued warranty obligations for pre-existing warranties during the period, including expirations Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Cash and cash equivalents held by foreign subsidiaries Cash, Held in Foreign Currency Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward]