Commitments and Contingencies Disclosure [Abstract] Purchase Obligation, Fiscal Year Maturity Purchase Obligation, Fiscal Year Maturity [Abstract] 2020 Purchase Obligation, Due in Next Twelve Months 2021 Purchase Obligation, Due in Second Year 2022 Purchase Obligation, Due in Third Year 2023 Purchase Obligation, Due in Fourth Year 2024 Purchase Obligation, Due in Fifth Year Thereafter Purchase Obligation, Due after Fifth Year Total Purchase Obligation Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Type of Performance Obligation [Axis] Type of Performance Obligation [Axis] Type of Performance Obligation [Axis] Type of Performance Obligation [Domain] Type of Performance Obligation [Domain] [Domain] for Type of Performance Obligation [Axis] Unique Configuration Unique Configuration [Member] Unique Configuration [Member] Limited Configuration Limited Configuration [Member] Limited Configuration [Member] Service and Other Service and Other [Member] Service and Other [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Commercial Commercial [Member] Commercial [Member] Live Events Live Events [Member] Live Events [Member] High School Park and Recreation High School Park and Recreation [Member] High School Park and Recreation [Member] Transportation Transportation [Member] Transportation [Member] International International [Member] International [Member] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Transferred at Point in Time Transferred at Point in Time [Member] Transferred over Time Transferred over Time [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Disaggregated revenue Revenue from Contract with Customer, Excluding Assessed Tax Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Cash and Cash Equivalents [Table Text Block] Schedule of Cash and Cash Equivalents [Table Text Block] Leases [Abstract] Components of Lease Cost Lease, Cost [Table Text Block] Supplemental Cash Flow Information Lessee, Operating Lease, Disclosure [Table Text Block] Lease Liability Schedule Lessee, Operating Lease, Liability, Maturity [Table Text Block] Income Statement [Abstract] Net sales Revenues Cost of sales Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Selling Selling Expense General and administrative General and Administrative Expense Product design and development Research and Development Expense Total operating expenses Operating Expenses Operating income Operating Income (Loss) Nonoperating income (expense): Nonoperating Income (Expense) [Abstract] Interest income Investment Income, Net Interest expense Interest Expense Other income (expense), net Other Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent 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 Fair Value Disclosures [Abstract] Fair Value Measurement Fair Value Disclosures [Text Block] Statement of Stockholders' Equity [Abstract] Cash dividends declared per share Common Stock, Dividends, Per Share, Declared Schedule of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Long-term Purchase Commitment Long-term Purchase Commitment [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Earnings Per Share Reconciliation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Disclosure Segment Reporting Disclosure [Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile net 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] Depreciation and amortization Depreciation, Amortization and Accretion, Net Loss on sale of property, equipment and other assets Gain (Loss) on Disposition of Property Plant Equipment Share-based compensation Share-based Compensation Equity in loss of affiliate Income (Loss) from Equity Method Investments Provision for doubtful accounts Provision for Doubtful Accounts Deferred income taxes, net Deferred Income Tax Expense (Benefit) Change in operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash used in 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, equipment and other assets 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 Purchases of and loans to equity investment Payments to Acquire Equity Method Investments Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Net cash provided by (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] Principal payments on long-term obligations Repayments of Long-term Debt Dividends paid Payments of Ordinary Dividends, Common Stock Proceeds from exercise of stock options Proceeds from Stock Options Exercised Payments for common shares repurchased Payments for Repurchase of Common Stock Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities EFFECT OF EXCHANGE RATE CHANGES Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 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 CASH, CASH EQUIVALENTS AND RESTRICTED CASH: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents End of period Cash payments for: Cash payments for: [Abstract] Interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Income taxes, net of refunds Income Taxes Paid, Net Supplemental schedule of non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] 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 ESPP Stock Issued Contingent consideration related to acquisition Supplemental Deferred Purchase Price Equity and Cost Method Investments [Abstract] Equity and Cost Method Investments [Abstract] Cost and Equity Method Investments Disclosure [Text Block] Cost and Equity Method Investments Disclosure [Text Block] Schedule of Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Rollforward of Level 3 Contingent Consideration Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Selected Financial Statement Data [Abstract] Selected Financial Statement Data [Abstract] Property, Plant and Equipment [Table] 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] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Land Land Buildings Buildings and Improvements, Gross Machinery and equipment Machinery and Equipment, Gross Office furniture and equipment Furniture and Fixtures, Gross Computer software and hardware Capitalized Computer Software, Gross Equipment held for rental Equipment held for rental Gross amount, as of the balance sheet date, of long-lived, depreciable equipment held for rental. Demonstration equipment Demonstration equipment Gross amount, as of the balance sheet date, of long-lived, depreciable equipment used for demonstration. Transportation equipment Transportation equipment Gross amount, as of the balance sheet date, of long-lived, depreciable equipment used for transportation. Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Property, Plant and Equipment, Net Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Contract assets Contract with Customer, Asset, Gross Contract liabilities - current Contract with Customer, Liability Contract liabilities - noncurrent Contract with Customer, Liability, Noncurrent Dollar Change Change in Contract with Customer, Asset and Liability [Abstract] Contract assets Contract with Customer, Asset, Increase (Decrease) Contract with Customer, Asset, Increase (Decrease) Contract liabilities - current Contract with Customer, Liability, Increase (Decrease), Current Contract with Customer, Liability, Increase (Decrease), Current Contract liabilities - noncurrent Contract with Customer, Liability, Increase (Decrease), Noncurrent Contract with Customer, Liability, Increase (Decrease), Noncurrent Change in Contract with Customer, Asset and Liability, Percentage [Abstract] Change in Contract with Customer, Asset and Liability, Percentage [Abstract] Change in Contract with Customer, Asset and Liability, Percentage [Abstract] Contract assets percent change Contract assets percent change Contract assets percent change Contract liabilities, current, percent change Contract liabilities, current, percent change Contract liabilities, current, percent change Contract liabilities, noncurrent, percent change Contract liabilities, noncurrent, percent change Contract liabilities, noncurrent, percent change Number of Loss on Contracts Number of Loss on Contracts Number of Loss on Contracts Provision for Loss on Contracts Provision for Loss on Contracts Revenue recognized related to contract liability Contract with Customer, Liability, Revenue Recognized Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Term of lease (years) Lessee, Operating Lease, Term of Contract Operating lease cost Operating Lease, Cost Weighted average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate (percent) Operating Lease, Weighted Average Discount Rate, Percent Operating lease payments Operating Lease, Payments Goodwill and Intangible Assets Disclosure [Abstract] Goodwill Goodwill Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive loss: 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 gain (loss) on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Total other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Reported Value Measurement [Member] Reported Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] 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 and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [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 bonds US States and Political Subdivisions Debt Securities [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: Available-for-sale Securities Derivatives - asset position Foreign Currency Contract, Asset, Fair Value Disclosure Derivatives - liability position Foreign Currency Contracts, Liability, Fair Value Disclosure Acquisition-related contingency consideration Business Combination, Contingent Consideration, Liability Assets (Liabilities), net Fair Value, Net Asset (Liability) 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, 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 Dilutive Effect of Share-based Payment Arrangements Diluted earnings per share (in shares) Per share income Earnings Per Share Reconciliation [Abstract] Basic earnings per share (in dollars per share) 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) Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Contingent Consideration Liability Contingent Consideration Liability [Member] Contingent Consideration Liability [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Acquisition-related contingency consideration as of April 27, 2019 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Interest Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Foreign currency translation Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Acquisition-related contingency consideration as of August 3, 2019 Equity Method Investments Equity Method Investments Equity in loss of affiliate Cost Method Investments Cost Method Investments Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Marketable Securities [Abstract] 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 Goodwill [Table] Schedule of Goodwill [Table] Commercial Commerical [Member] Commerical [Member] Goodwill Goodwill [Line Items] Goodwill Goodwill [Roll Forward] Balance as of April 27, 2019 Goodwill Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Balance as of August 3, 2019 Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Remaining performance obligation recognition period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Remaining performance obligation, service agreements Revenue, Remaining Performance Obligation, Service Agreements Revenue, Remaining Performance Obligation, Service Agreements Remaining performance obligation, products Revenue, Remaining Performance Obligation, Products Revenue, Remaining Performance Obligation, Products Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] 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 Basis of Presentation and Summary of Critical Accounting Policies Significant Accounting Policies [Text Block] Derivative [Table] Derivative [Table] Derivative, by Nature [Axis] Derivative Instrument [Axis] Derivative, Name [Domain] Derivative Contract [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/Swiss Franc USD to CHF [Member] [Member] USD to CHF [Member] [Domain] U.S. Dollars/Malaysian Ringgit USD to MYR [Member] USD to MYR [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Derivative Derivative [Line Items] Foreign currency exchange forward contracts Derivative, Notional Amount, Asset (Liability) Derivative, Notional Amount, Asset (Liability) Derivatives - currency forward contract, asset Derivatives - currency forward contracts, liability Derivative term (months) Derivative, Term of Contract Receivables [Abstract] Receivables Financing Receivables [Text Block] Class of Stock Disclosures [Abstract] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Stock Repurchased During Period, Value Stock Repurchased During Period, Value Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Earnings Per Share EPS Earnings Per Share [Text Block] Treasury Stock [Text Block] Treasury Stock [Text Block] Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES Outside United States Non-US [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Net sales: Geographic Areas, Revenues from External Customers [Abstract] Long-lived assets: Geographic Areas, Long-Lived Assets [Abstract] Long-lived assets Long-Lived Assets 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 Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Performance guarantees Performance Guarantee [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] Guarantor Obligations Guarantor Obligations [Line Items] Guarantees: Guarantees [Abstract] Performance guarantees outstanding Loss Contingency Accrual Warranties: Product Warranties Disclosures [Abstract] Movement in Standard Product Warranty Accrual Movement in Standard Product Warranty Accrual [Roll Forward] Beginning accrued warranty obligations Standard and Extended Product Warranty Accrual Warranties issued during the period Standard and Extended Product Warranty Accrual, Increase for Warranties Issued Settlements made during the period Standard and Extended Product Warranty Accrual, Decrease for Payments 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 Ending accrued warranty obligations Business Combinations [Abstract] Business Combination Business Combination Disclosure [Text Block] Selected Financial Statement Data Additional Financial Information Disclosure [Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] 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] Stock Options Employee Stock Option [Member] 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 (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 Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Municipal bonds Schedule of Available-for-sale Securities Debt Securities, Available-for-sale [Line Items] Less than 12 months Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Greater than 12 months Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Total Debt Securities, Available-for-sale Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Contract with Customer, Asset and Liability Contract with Customer, Asset and Liability [Table Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] 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 [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 Contract and Leases Receivable, Interest Rate Contract 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, Next Twelve Months 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 Contract assets Contract with Customer, Asset, Net, Current Current maturities of long-term receivables Notes, Loans and Financing Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Income tax receivables Income Taxes Receivable, Current Property and equipment and other assets available for sale Disposal Group, Including Discontinued Operation, Assets, Current Total current assets Assets, Current Long-term receivables, less current maturities Notes, Loans and Financing Receivable, Net, Noncurrent Goodwill Intangibles, net Finite-Lived Intangible Assets, Net Investment in affiliates and other assets Investments and Other Noncurrent Assets Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Noncurrent TOTAL ASSETS Assets CURRENT LIABILITIES: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Contract liabilities Contract with Customer, Liability, Current Accrued expenses Accrued Liabilities, Current Warranty obligations Product Warranty Accrual, Current Income taxes payable Accrued Income Taxes, Current Total current liabilities Liabilities, Current Long-term warranty obligations Product Warranty Accrual, Noncurrent Long-term contract liabilities Other long-term obligations Other Liabilities, Noncurrent Long-term income taxes payable Liability for Uncertainty in Income Taxes, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Total long-term liabilities Liabilities, Noncurrent Common Stock, no par value, authorized 115,000,000 shares; 45,442,607 and 45,317,267 shares issued at August 3, 2019 and April 27, 2019, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Treasury Stock, at cost, 490,617 and 303,957 shares at August 3, 2019 and April 27, 2019, respectively Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax TOTAL SHAREHOLDERS' EQUITY Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity 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 Loss AOCI Attributable to Parent [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance at Beginning of Period 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 Dividends paid Dividends, Common Stock, Cash Treasury stock purchase Treasury Stock, Value, Acquired, Cost Method Balance at End of Period Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Amendment Flag Document Period End Date 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] Leases Lessee, Operating Leases [Text Block] Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Unrecognized tax benefits that would affect our effective tax rate if recognized Unrecognized Tax Benefits that Would Impact Effective Tax Rate Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Unallocated Segment Reconciling Items [Member] Segment Reporting Information Segment Reporting Information [Line Items] Number of business units Number of Reportable Segments Gross profit Contribution Margin Contribution Margin Contribution Margin Depreciation and amortization Depreciation, Depletion and Amortization [Abstract] Depreciation, amortization, and impairment Depreciation, Depletion and Amortization Non-allocated operating expenses: Other income (expense), net Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total lease liabilities Operating Lease, Liability Lessee, Operating Lease, Option To Extend, Payment Lessee, Operating Lease, Option To Extend, Payment Lessee, Operating Lease, Option To Extend, Payment Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statement of cash flows Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Operating Lease, Liability, Current Operating Lease, Liability, Current Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent