Entity Central Index Key Sales revenue services including reversals. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term marketable securities Marketable Securities Current Accounts receivable, net of allowance for doubtful accounts of $507 and $752 as of January 31, 2018 and July 31, 2017, respectively Accounts Receivable Net Current Inventory Inventory Net Income tax receivable Income Taxes Receivable Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Long-term marketable securities Marketable Securities Noncurrent Property, plant, and equipment, net Property Plant And Equipment Net Intangible assets, net Intangible Assets Net Excluding Goodwill Goodwill Goodwill Deferred income taxes Deferred Tax Assets Net Noncurrent Other assets Other Assets Noncurrent Total assets Assets Liabilities and Stockholders’ Equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued employee compensation and benefits Employee Related Liabilities Current Accrued income tax Accrued Income Taxes Current Accrued warranty Product Warranty Accrual Classified Current Accrued restructuring charges Restructuring Reserve Current Deferred revenue Deferred Revenue Current Customer deposits Customer Advances And Deposits Current Other current liabilities Other Liabilities Current Total current liabilities Liabilities Current Long-term liabilities: Liabilities Noncurrent [Abstract] Accrued income taxes, net of current portion Accrued Income Taxes Noncurrent Other long-term liabilities Other Liabilities Noncurrent Total long-term liabilities Liabilities Noncurrent Guarantees, commitments and contingencies (Note 15) Commitments And Contingencies Stockholders’ Equity: Stockholders Equity [Abstract] Common stock, $0.05 par value; 30,000,000 shares authorized and 12,493,837 shares issued and outstanding as of January 31, 2018; 30,000,000 shares authorized and 12,467,824 shares issued and outstanding as of July 31, 2017 Common Stock Value Capital in excess of par value Additional Paid In Capital Common Stock Retained earnings Retained Earnings Accumulated Deficit Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Accounts receivable, allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Current Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Net revenue: Revenues [Abstract] Product Sales Revenue Goods Net Engineering Sales Revenue Services Net Total net revenue Revenues Cost of sales: Cost Of Goods And Services Sold [Abstract] Product Cost Of Goods Sold Engineering Technology Services Costs Total cost of sales Cost Of Goods And Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and product development Research And Development Expense Selling and marketing Selling And Marketing Expense General and administrative General And Administrative Expense Restructuring Restructuring Charges Asset impairment charges Asset Impairment Charges Total operating expenses Operating Expenses Income from operations Operating Income Loss Other income (expense), net Nonoperating Income Expense Income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net income Net Income Loss Net income per common share: Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted average shares outstanding: Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Dividends declared and paid per share Common Stock Dividends Per Share Cash Paid Statement Of Income And Comprehensive Income [Abstract] Net income Other comprehensive income (loss), net of tax: Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract] Foreign currency translation adjustment, net of tax Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent Unrecognized gain on pension benefits, net of tax Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent Unrealized gain (loss) on foreign currency forward contracts, net of tax Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent Unrealized loss on available-for-sale securities, net of tax Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent Total other comprehensive income (loss), net of tax Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Total comprehensive income Comprehensive Income Net Of Tax Proceeds from maturities of marketable securities. Proceeds from sales of marketable securities. Noncash Transfer of Demonstration Inventory to Fixed Asset Statement Of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Provision for (benefit from) deferred income taxes Deferred Income Tax Expense Benefit Depreciation and amortization Depreciation Depletion And Amortization Share-based compensation expense Share Based Compensation Amortization of demo equipment Tangible Asset Impairment Charges Provision for excess and obsolescence inventory Inventory Write Down Excess tax benefit from share-based compensation Excess Tax Benefit From Share Based Compensation Operating Activities Change in fair value of contingent consideration Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 (Benefit from) provision for doubtful accounts, net of recovery Allowance For Doubtful Accounts Receivable Period Increase Decrease Loss on sale of property, plant and equipment Gain Loss On Sale Of Property Plant Equipment Net changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Inventory Increase Decrease In Inventories Prepaid expenses and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Accrued liabilities Increase Decrease In Accrued Liabilities Deferred revenue Increase Decrease In Deferred Revenue Customer deposits Increase Decrease In Customer Advances And Deposits Accrued income taxes and income taxes receivable Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable Other liabilities Increase Decrease In Other Current Liabilities NET CASH PROVIDED BY OPERATING ACTIVITIES Net Cash Provided By Used In Operating Activities Continuing Operations CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Additions to property, plant, and equipment Payments To Acquire Property Plant And Equipment Purchases of marketable securities Payments To Acquire Marketable Securities Proceeds from maturities of marketable securities Proceeds From Maturities Of Marketable Securities Proceeds from sales of marketable securities Proceeds From Sales Of Marketable Securities Proceeds from the sale of property, plant, and equipment Proceeds From Sale Of Property Plant And Equipment NET CASH USED IN INVESTING ACTIVITIES Net Cash Provided By Used In Investing Activities Continuing Operations CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Repurchase of common stock Payments For Repurchase Of Common Stock Shares repurchased for taxes for vested employee restricted stock grants Payments Related To Tax Withholding For Share Based Compensation Excess tax benefit from share-based compensation Excess Tax Benefit From Share Based Compensation Financing Activities Dividends paid to shareholders Payments Of Dividends NET CASH USED IN FINANCING ACTIVITIES Net Cash Provided By Used In Financing Activities Continuing Operations EFFECT OF EXCHANGE RATE CHANGES ON CASH Effect Of Exchange Rate On Cash And Cash Equivalents NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS Cash And Cash Equivalents Period Increase Decrease CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS, END OF PERIOD Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Non-cash transfer of demonstration inventory to fixed asset Noncash Transfer Of Demonstration Inventory To Fixed Asset Accounting Policies [Abstract] Basis of presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Changes And Error Corrections [Abstract] Recent accounting pronouncements New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Risks And Uncertainties [Abstract] Accounts receivable, net Concentration Risk Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Inventory Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Intangible assets and goodwill Goodwill And Intangible Assets Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair value measurements Fair Value Disclosures [Text Block] Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivative instruments Derivative Instruments And Hedging Activities Disclosure [Text Block] Share Repurchase Program Disclosure Text Block [Abstract] Common stock repurchases Share Repurchase Program Disclosure [Text Block] Equity [Abstract] Accumulated other comprehensive income Comprehensive Income Note [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Share-based compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Restructuring And Related Activities [Abstract] Restructuring charges Restructuring And Related Activities Disclosure [Text Block] Net income per common share Earnings Per Share [Text Block] Income Tax Disclosure [Abstract] Income taxes Income Tax Disclosure [Text Block] Segment Reporting [Abstract] Segment information Segment Reporting Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Guarantees, commitments and contingencies Commitments And Contingencies Disclosure [Text Block] Subsequent Events [Abstract] Subsequent events Subsequent Events [Text Block] Recent accounting pronouncements New Accounting Pronouncements Policy Policy [Text Block] Percentage of Net Product and Engineering Revenue from Major Customers Schedule Of Revenue By Major Customers By Reporting Segments Table [Text Block] Schedule of accounts receivable by major customer, percent. Summary of Net Accounts Receivable Due from Customers With Net Accounts Receivable Balance Greater than or Equal to 10% of Net Account Receivable Balance Schedule Of Accounts Receivable By Major Customer Percent Table [Text Block] Components of inventory, net Schedule Of Inventory Current Table [Text Block] Finite-Lived Intangible Assets Schedule Of Finite Lived Intangible Assets Table [Text Block] Goodwill Balance by Reportable Segments and Reporting Unit Schedule Of Intangible Assets And Goodwill Table [Text Block] Rollforward of Accumulated Goodwill Impairment Losses by Reportable Segment and Reporting Unit Schedule Of Goodwill [Text Block] Statement [Table] Statement [Table] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Cash, cash equivalents and marketable securities. Cash, Cash Equivalents and Marketable Securities Cash Cash Equivalents And Marketable Securities [Member] Deferred compensation plan assets. Plan Assets for Deferred Compensation Deferred Compensation Plan Assets [Member] Foreign currency forward contracts. Foreign Currency Forward Contracts Foreign Currency Forward Contracts [Member] Statement [Line Items] Statement [Line Items] Assets and Liabilities Carried at Fair Value and Measured on Recurring Basis Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Changes in Accumulated Other Comprehensive (Loss) Income Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Share-Based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock awarded, including, but not limited to: (a) stock price, (b) expected volatility factor, (c) risk-free rate(s), and (d) expected annual dividend yield. Fair Value of TSR Performance-Based Awards Grant Assumptions Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used Table [Text Block] Summary of Charges Related to Accrued Restructuring Activities Schedule Of Restructuring Reserve By Type Of Cost [Text Block] Restructuring and Related Charges by Segment Schedule Of Restructuring And Related Costs [Text Block] Computation of Basic and Diluted Net Income Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Effective Income Tax Rate [Table Text Block] Provision for Income Taxes and Effective Tax Rate Effective Income Tax Rate Table [Text Block] Reportable Segment Information Schedule Of Segment Reporting Information By Segment [Text Block] Product Warranty Liability Schedule Of Product Warranty Liability Table [Text Block] Receivables [Abstract] Schedule Of Accounts Notes Loans And Financing Receivable [Table] Schedule Of Accounts Notes Loans And Financing Receivable [Table] Concentration Risk Benchmark Concentration Risk By Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Sales Revenue, Net Sales Revenue Net [Member] Concentration Risk Type Concentration Risk By Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Largest customers Customer Concentration Risk [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts Notes And Loans Receivable [Line Items] Percentage of total net revenue Concentration Risk Percentage1 Concentration Risk [Table] Concentration Risk [Table] Customer Major Customers [Axis] Customer Name Of Major Customer [Domain] Koninklijke Philips Electronics N.V. Philips Koninklijke Philips Electronics Nv [Member] Siemens AG. Siemens AG Siemens Ag [Member] L-3 Communications Corporation. L-3 L Three Communications Corporation [Member] Toshiba Corporation. Toshiba Toshiba Corporation [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Percentage of net product and engineering revenue Range Range [Axis] Range Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Accounts Receivable Accounts Receivable [Member] Credit Concentration Risk Credit Concentration Risk [Member] General Electric Corporation. GE General Electric Corporation [Member] Smiths detection. Smiths Detection Smiths Detection [Member] Percentage of net accounts receivable 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 Total inventory Goodwill and Intangible Assets Disclosure [Line Items] Goodwill and Intangible Assets Disclosure [Table] Goodwill And Intangible Assets Disclosure [Table] Goodwill And Intangible Assets Disclosure [Table] Segments Statement Business Segments [Axis] Segments Segment [Domain] Security and detection. Security and Detection Security And Detection [Member] Medical imaging. Medical Imaging Medical Imaging [Member] Goodwill and Intangible Assets Disclosure [Line Items] Goodwill And Intangible Assets Disclosure [Line Items] Indefinite lived intangible assets Indefinite Lived Intangible Assets Excluding Goodwill Intangible assets, estimated useful lives Finite Lived Intangible Asset Useful Life Schedule Of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Developed technologies Developed Technology Rights [Member] Customer relationships Customer Relationships [Member] Trade names Trade Names [Member] Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Weighted-Average Amortization Period Acquired Finite Lived Intangible Assets Weighted Average Useful Life Cost Finite Lived Intangible Assets Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Net Finite Lived Intangible Assets Net Amortization expense related to acquired intangible assets Amortization Of Intangible Assets Ultrasound. Ultrasound Ultrasound [Member] Reporting unit. Reporting Unit Reporting Unit [Axis] Reporting unit. Reporting Unit Reporting Unit [Domain] Medical imaging reporting unit. Medical Imaging Reporting Unit Medical Imaging Reporting Unit [Member] Ultrasound reporting unit. Ultrasound Reporting Unit Ultrasound Reporting Unit [Member] Oncura reporting unit. Oncura Reporting Unit Oncura Reporting Unit [Member] Security and detection reporting unit. Security And Detection Reporting Unit Security And Detection Reporting Unit [Member] Finite Lived Intangible Assets [Line Items] Goodwill Goodwill Roll Forward Goodwill, beginning balance Goodwill, ending balance Accumulated impairment losses, beginning balance Goodwill Impaired Accumulated Impairment Loss Accumulated impairment losses, ending balance Number of Reporting Units Number Of Reporting Units Number of Reportable Segments Number Of Reportable Segments Impairment of goodwill Goodwill Impairment Loss Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Fair Value, Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value Measurements Recurring [Member] Fair Value, Hierarchy Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Cash and Cash Equivalents Cash And Cash Equivalents [Axis] Cash and Cash Equivalents Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Cash Cash [Member] Money Market Funds Money Market Funds [Member] U.S. Agency Securities U S Government Corporations And Agencies Securities [Member] Commercial Paper Commercial Paper [Member] Major Types of Debt and Equity Securities Major Types Of Debt And Equity Securities [Axis] Major Types of Debt and Equity Securities Major Types Of Debt And Equity Securities [Domain] Non-U.S. government securities. Non-U.S. government securities Non U S Government Securities [Member] Corporate Securities Corporate Debt Securities [Member] Asset-Backed Securities Asset Backed Securities [Member] US Treasury Securities U S Treasury Securities [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Adjusted Cost Available For Sale Securities Amortized Cost Unrealized Gains Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax Unrealized Losses Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax Fair Value Available For Sale Securities Cash and Cash Equivalents Cash And Cash Equivalents Fair Value Disclosure Marketable Securities Marketable Securities Deferred Compensation Plan Assets Fair Value Plan assets for deferred compensation Deferred Compensation Plan Assets Fair Value Total Assets Fair Value Disclosure Foreign currency forward contracts asset Foreign Currency Contract Asset Fair Value Disclosure Total Fair Value Net Asset Liability Derivative [Table] Derivative [Table] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Forward Contracts Forward Contracts [Member] Hedging Designation Hedging Designation [Axis] Hedging Designation Hedging Designation [Domain] Designated as Hedging Instrument Designated As Hedging Instrument [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Cost Of Good Sold and Operating Expense [Member] Cost of Revenue and Operating Expenses Cost Of Good Sold And Operating Expense [Member] Derivative [Line Items] Derivative [Line Items] Notional amount of cash flow hedge instruments Derivative Notional Amount Unrealized gain on cash flow hedges Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax Derivative asset, current Derivative Assets Current Realized gains (losses) on cash flow hedge instruments Gain Loss On Cash Flow Hedge Ineffectiveness Net Uncategorized [Abstract] Uncategorized [Abstract] Stockholders equity note. Stockholders equity note. Stockholders Equity Note [Table] Stockholders Equity Note [Table] Share Repurchase Program Share Repurchase Program [Axis] Share Repurchase Program Share Repurchase Program [Domain] Stock repurchase plan six. 2016 Repurchase program Stock Repurchase Plan Six [Member] Stockholders Equity Note [Line Items] Stockholders Equity Note [Line Items] Amount authorized for repurchase of Company's common stock Stock Repurchase Program Authorized Amount1 Repurchase of common stock (in shares) Stock Repurchased And Retired During Period Shares Repurchase of common stock Stock Repurchased And Retired During Period Value Average purchase price of common stock Treasury Stock Acquired Average Cost Per Share Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income Loss [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Unrealized Losses on Available For Sale Securities Accumulated Net Unrealized Investment Gain Loss [Member] Unrealized Gain (Loss) on Foreign Currency Forward Contracts Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Unrealized Gains (Losses) on Pension Plan Accumulated Defined Benefit Plans Adjustment [Member] Currency Translation Adjustment Accumulated Translation Adjustment [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income Loss [Line Items] Beginning balance Pre-tax change before reclassification to earnings Oci Before Reclassifications Before Tax Attributable To Parent Amount reclassified to earnings Reclassification From Aoci Current Period Before Tax Attributable To Parent Income tax benefit (provision) Other Comprehensive Income Loss Tax Portion Attributable To Parent1 Ending balance 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] Cost of Product Sales Cost Of Sales [Member] Cost of sales services. Cost of Engineering Sales Cost Of Sales Services [Member] Research and Product Development Research And Development Expense [Member] Selling and Marketing Selling And Marketing Expense [Member] General and Administrative General And Administrative Expense [Member] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Total share-based compensation expense before tax Allocated Share Based Compensation Expense Income tax effect Employee Service Share Based Compensation Tax Benefit From Compensation Expense Share-based compensation expense included in net income Allocated Share Based Compensation Expense Net Of Tax 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 Award Type [Axis] Equity Award Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Outstanding Stock Awards Stock Compensation Plan [Member] Time Based Restricted Stock Units (RSU) [Member] Time Based Restricted Stock Units Time Based Restricted Stock Units [Member] Shareholder return. Total Shareholders Return Performance-based Awards Shareholder Return [Member] Performance Based Earnings Per Share Non GAAP Award [Member] Non-GAAP EPS Performance-Based Awards Performance Based Earnings Per Share Non Gaap Award [Member] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Stock Option and Restricted Stock Bonus Plans [Member] Stock Option and Restricted Stock Bonus Plans Stock Option And Restricted Stock Bonus Plans [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Stock options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Intrinsic value of options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Shares vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Options, grants in period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Time based restricted stock awards. Time Based Restricted Stock Awards Time Based Restricted Stock Awards [Member] Performance based restricted stock award. Performance Based Restricted Stock Awards Performance Based Restricted Stock Award [Member] Stock price Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Expected volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Expected annual dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Weighted average grant date fair value of time-based restricted stock awards Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Total fair value of restricted stock grants vested in period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value Unrecognized compensation cost related to non-vested share-based compensation arrangements Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Unrecognized compensation cost related to non-vested share-based compensation arrangements, weighted average period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Schedule Of Restructuring And Related Costs [Table] Schedule Of Restructuring And Related Costs [Table] Restructuring Plan Restructuring Plan [Axis] Restructuring Plan Restructuring Plan [Domain] Restructuring plan two thousand seventeen. Fiscal Year 2017 Restructuring Plan Restructuring Plan Two Thousand Seventeen [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost And Reserve [Line Items] Restructuring Charge Restructuring reserve accrual non-cash adjustment. Restructuring Type Restructuring Cost And Reserve [Axis] Type of Restructuring Type Of Restructuring [Domain] Employee Severance and Benefits Employee Severance [Member] Facility Exit Costs Facility Closing [Member] Balance at beginning period Restructuring Reserve Restructuring charge Severance Costs1 Adjustments Restructuring Reserve Accrual Adjustment1 Cash payments Payments For Restructuring Non-cash adjustments Restructuring Reserve Accrual Non Cash Adjustment Balance at end period Restructuring and related charges Restructuring Costs Net income Weighted average number of common shares outstanding-basic Effect of dilutive securities: Dilutive Securities [Abstract] Stock options and restricted stock units Incremental Common Shares Attributable To Share Based Payment Arrangements Weighted average number of common shares outstanding-diluted Basic net income per share Diluted net income per share Anti-dilutive shares related to outstanding stock options and unvested restricted stock Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Effective tax rate Effective Income Tax Rate Continuing Operations Income Taxes [Line Items] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Scenario Statement Scenario [Axis] Scenario, Unspecified Scenario Unspecified [Domain] Scenario Forecast Scenario Forecast [Member] Income Taxes [Line Items] Income Taxes [Line Items] U.S. Federal statutory tax rate Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate Tax cuts and jobs act of 2017 incomplete accounting provisional income tax expense benefit. Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, provisional income tax expense (benefit). Discrete tax benefit Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate Provisional estimate amount for one-time transition tax Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit Tax expense for net shortfall on exercise of stock compensation Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost Provisional amount of tax expense on remeasurement of deferred tax balance Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Provisional Income Tax Expense Benefit Tax Cuts and Jobs Act of 2017, incomplete accounting provisional income tax expense benefit, payment period. Provisional estimate amount for one-time transition tax, payment period Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit Payment Period Unrecognized tax benefits, accrued interest and penalties Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued Unrecognized tax benefits, for uncertain tax positions Unrecognized Tax Benefits Number of segments Number Of Operating Segments Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Consolidation Items Consolidation Items [Axis] Consolidation Items Consolidation Items [Domain] Reportable segments Operating Segments [Member] Corporate Corporate Non Segment [Member] Total Identifiable Assets Assets Total [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Product revenue: Sales Revenue Goods Net [Abstract] Product revenue Engineering revenue: Sales Revenue Services Net [Abstract] Engineering revenue Engineering revenue Sales Revenue Services Including Reversals Income (loss) from operations: Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments [Abstract] Total (loss) income from operations Total other income (loss), net Income before income taxes Sum of the carrying amounts as of the balance sheet date of all assets that are recognized, excluding goodwill. Identifiable total assets by segment: Assets Identifiable assets (excluding goodwill) Assets Excluding Goodwill Cash, cash equivalents and short-term marketable securities Cash Cash Equivalents And Short Term Investments Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Table] Loss Contingency Nature Loss Contingencies By Nature Of Contingency [Axis] Loss Contingency, Nature Loss Contingency Nature [Domain] Product Extended Warranty Contracts [Member] Product Extended Warranty Contracts Product Extended Warranty Contracts [Member] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Revolving Credit Facility Termination [Member] Revolving Credit Facility Termination Revolving Credit Facility Termination [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] LIBOR Rate London Interbank Offered Rate L I B O R [Member] Base Rate Base Rate [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Other Credit Facilities [Member] Other Revolving Credit Facilities Other Credit Facilities [Member] Litigation Status Litigation Status [Axis] Litigation Status Litigation Status [Domain] Pending Litigation Pending Litigation [Member] Commitments and Contingencies Disclosure [Line Items] Commitments And Contingencies Disclosure [Line Items] Liabilities related to agreements Contractual Obligation Standard product warranty time period. Standard product warranty term Standard Product Warranty Time Period Product Warranties Disclosures [Abstract] Beginning balance Product Warranty Accrual Provision Product Warranty Accrual Warranties Issued Warranty activity during the period Product Warranty Accrual Payments Ending balance Deferred revenue Deferred Revenue Revolving Credit Agreement Period Revolving credit agreement period Revolving Credit Agreement Period Credit facility maximum borrow capacity Line Of Credit Facility Maximum Borrowing Capacity Credit facility, expiry date Line Of Credit Facility Expiration Date1 Prior credit facility, start date Line Of Credit Facility Initiation Date1 Aggregate available credit amount under specified circumstances Line Of Credit Facility Capacity Available For Specific Purpose Other Than For Trade Purchases Variable interest rate Debt Instrument Basis Spread On Variable Rate1 Credit facility commitment fee percentage Line Of Credit Facility Unused Capacity Commitment Fee Percentage Leverage Ratio Of Debt To Earnings Before Interest Tax Depreciation And Amortization Leverage ratio of total debt to earnings before interest, taxes, depreciation, and amortization or EBITDA Leverage Ratio Of Debt To Earnings Before Interest Tax Depreciation And Amortization Interest Coverage ratio Interest coverage ratio Interest Coverage Ratio Leverage Ratio Leverage ratio Leverage Ratio Interest expense Interest Expense Credit Facility Transaction Costs Incurred Credit facility transaction costs incurred Credit Facility Transaction Costs Incurred Credit facility, maturity period Debt Instrument Term Credit facility available borrowing capacity Line Of Credit Facility Remaining Borrowing Capacity Line of credit amount outstanding Line Of Credit Excess of unspecified damages Loss Contingency Estimate Of Possible Loss Loss Contingency, Number of Plaintiffs Loss Contingency Number Of Plaintiffs Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Dividend declaration date Dividends Payable Date Declared Day Month And Year Dividend declared Common Stock Dividends Per Share Declared Dividend payable date Dividend Payable Date To Be Paid Day Month And Year Dividend record date Dividends Payable Date Of Record Day Month And Year