Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill
Schedule of Goodwill [Table Text Block]
Schedule of Intangible Assets
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]
Schedule of Expected Future Amortization Expense
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Reclassified gain (loss) as a result of discontinuance of cash flow hedges
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness
Inventory Disclosure [Abstract]
Schedule of Inventories
Schedule of Inventory, Current [Table Text Block]
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Balance at March 31, 2016
Goodwill
Foreign currency translation impact
Goodwill, Foreign Currency Translation Gain (Loss)
Balance at June 30, 2016
Summary of Notional Amounts and Fair Values of Derivative Instruments on Consolidated Balance Sheet
Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block]
Summary of Effect of Foreign Exchange Forward Contracts on OCI and Results of Operations
Derivative Instruments, Gain (Loss) [Table Text Block]
Segment Reporting [Abstract]
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]
Reportable Geographical Components
Reportable Geographical Components [Member]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
United States
UNITED STATES
Europe
Europe [Member]
Asia
Asia [Member]
Rest of the world
Rest Of World [Member]
Rest Of The world [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Total revenue
Revenues
SEGMENT AND GEOGRAPHIC INFORMATION
Segment Reporting Disclosure [Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
SHARE-BASED COMPENSATION
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Senior secured revolving credit facility
Revolving Credit Facility [Member]
Letter of credit sub-facility
Letter of Credit [Member]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Line of credit
Line of Credit [Member]
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Common Stock Repurchase Plan
Common Stock Repurchase Plan [Member]
Common Stock Repurchase Plan [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
Federal funds effective rate
Federal Funds Effective Rate [Member]
Federal funds effective rate [Member]
LIBOR
London Interbank Offered Rate (LIBOR) [Member]
Base rate
Base Rate [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
LIBOR loans
LIBOR Loans [Member]
LIBOR Loans [Member]
Base rate loans
Base Rate Loans [Member]
Base rate loans [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Maximum
Maximum [Member]
Minimum
Minimum [Member]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Foreign Subsidiaries
Foreign Subsidiaries [Member]
Foreign Subsidiaries [Member]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Prepaid expenses and other current assets
Prepaid Expenses and Other Current Assets [Member]
Other assets
Other Noncurrent Assets [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Debt term
Debt Instrument, Term
Credit facility
Line of Credit Facility, Maximum Borrowing Capacity
Stock authorized to repurchase under stock repurchase program (in shares)
Stock Repurchase Program, Number of Shares Authorized to be Repurchased
Amount outstanding under credit facility
Long-term Line of Credit
Interest rate in excess of effective rate
Debt Instrument, Basis Spread on Variable Rate
Leverage ratio
Leverage Ratio
Leverage Ratio
Commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
Voting stock pledge limit for any foreign subsidiary
Capital Stock Pledge, Percentage
Capital Stock Pledge, Percentage
Debt default, acceleration clause, required consent percentage
Debt Instrument, Debt Default, Acceleration Clause, Required Consent Percentage
Debt Instrument, Debt Default, Acceleration Clause, Required Consent Percentage
Unamortized debt issuance costs
Unamortized Debt Issuance Expense
Investments, Debt and Equity Securities [Abstract]
Summary of Marketable Securities
Marketable Securities [Table Text Block]
Summary of Contractual Maturities of Marketable Securities
Available-for-sale Securities [Table Text Block]
Related Party Transactions [Abstract]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Counterparty Name [Axis]
Counterparty Name [Axis]
Counterparty Name [Domain]
Counterparty Name [Domain]
EMC, Corp.
EMC, Corp. [Member]
EMC, Corp. [Member]
Mitre Corp.
Mitre Corp. [Member]
Mitre Corp. [Member]
State Street
State Street [Member]
State Street [Member]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Member of board of directors
Director [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Revenue from related parties
Revenue from Related Parties
Earnings Per Share [Abstract]
Numerator:
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (loss)
Net Income (Loss) Attributable to Parent
Denominator:
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Denominator for basic net income per share - weighted average common shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Basic
Dilutive common equivalent shares:
Effects Of Dilutive Common Stock On Weighted Average Number Of Shares [Abstract]
Effects Of Dilutive Common Stock On Weighted Average Number Of Shares [Abstract]
Weighted average stock options (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Weighted average restricted stock units (in shares)
Weighted Average Number of Shares, Restricted Stock
Denominator for diluted net income per share - weighted average shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Net income (loss) per share:
Net Income Loss Per Share [Abstract]
Net Income Loss Per Share [Abstract]
Basic net income (loss) per share (in USD per share)
Earnings Per Share, Basic
Diluted net income (loss) per share (in USD per share)
Earnings Per Share, Diluted
Equity [Abstract]
TREASURY STOCK
Treasury Stock [Text Block]
Compensation and Retirement Disclosure [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Pension Plan
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Net periodic pension cost
Defined Benefit Plan, Net Periodic Benefit Cost
Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]
Derivative Instruments, Gain (Loss) [Table]
Derivative Instrument Risk [Axis]
Derivative Instrument [Axis]
Derivative Contract Type [Domain]
Derivative Contract [Domain]
Forward contracts
Forward Contracts [Member]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Cash flow hedges
Cash Flow Hedging [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Designated as hedging instrument
Designated as Hedging Instrument [Member]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Research and development
Research and Development Expense [Member]
Sales and marketing
Selling and Marketing Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net
Gain (Loss) Reclassified from Accumulated OCI into Income
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net
Summary of Total Revenue by Geography
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
Statement of Comprehensive Income [Abstract]
Changes in market value of derivatives, taxes
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax
Reclassification adjustment for net losses included in net income (loss), benefits
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs [Table]
Schedule of Restructuring and Related Costs [Table]
Restructuring Type [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Severance
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Restructuring charges
Restructuring Charges
Restructuring and Related Cost, Number of Employees Terminated
Restructuring and Related Cost, Number of Employees Terminated
Restructuring and Related Cost, Number of Employees Terminated
Schedule of Calculations of the Basic and Diluted Net Income (Loss) Per Share and Potential Common Shares
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Summary of Antidilutive Securities Excluded from Computation of Diluted EPS
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Prepaid Expenses and Other Current Assets
Other Current Assets [Member]
Accrued Other
Accrued Other Liabilities [Member]
Accrued Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Notional Amounts
Derivative, Notional Amount
Prepaid Expenses and Other Current Assets
Derivative Instruments in Hedges, Assets, at Fair Value
Accrued Other
Derivative Instruments in Hedges, Liabilities, at Fair Value
Business Combinations [Abstract]
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Information [Abstract]
Pro forma revenue
Business Acquisition, Pro Forma Revenue
Pro forma net loss
Business Acquisition, Pro Forma Net Income (Loss)
Pro forma net loss per share:
Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted [Abstract]
Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)
Business Acquisition, Pro Forma Earnings Per Share, Basic
Diluted (in dollars per share)
Business Acquisition, Pro Forma Earnings Per Share, Diluted
Pro forma shares outstanding
Pro Forma Weighted Average Shares Outstanding, Basic and Diluted [Abstract]
Pro Forma Weighted Average Shares Outstanding, Basic and Diluted [Abstract]
Basic (in shares)
Weighted Average Basic Shares Outstanding, Pro Forma
Diluted (in shares)
Pro Forma Weighted Average Shares Outstanding, Diluted
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]
Restricted stock units
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Restricted stock units (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
LONG-TERM DEBT
Long-term Debt [Text Block]
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Simena
Simena Llc [Member]
Simena Llc [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Level 3
Fair Value, Inputs, Level 3 [Member]
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurement Frequency [Domain]
Fair value, measurements, recurring
Fair Value, Measurements, Recurring [Member]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Domain]
Major Types of Debt and Equity Securities [Domain]
Contingent Purchase Consideration
Contingent Purchase Consideration [Member]
Contingent purchase consideration [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingently returnable consideration
Business Combination, Contingent Consideration, Asset
Contingent purchase consideration
Business Combination, Contingent Consideration, Liability
Deal related compensation expense, accretion charges and changes related to settlements of contractual non-compliance liabilities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]
Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Legacy NetScout
Legacy [Member]
Legacy [Member]
Arbor Networks
Arbor Networks [Member]
Arbor Networks [Member]
Service assurance for service provider
Tektronix Communications [Member]
Tektronix Communications [Member]
Network visibility
VSS Monitoring [Member]
VSS Monitoring [Member]
Service assurance for enterprise
FNET [Member]
FNET [Member]
Indefinite-lived Intangible Assets [Axis]
Indefinite-lived Intangible Assets [Axis]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Trade name
Trade Names [Member]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Acquired software and core technology
Acquired Software And Core Technology [Member]
Acquired Software And Core Technology [Member]
Other acquired intangible assets
Other Acquired Intangible Assets [Member]
Other Acquired Intangible Assets [Member]
Developed and core technology
Developed and Core Technology [Member]
Developed and Core Technology [Member]
Customer and distributor relationships
Customer and Distributor Relationships [Member]
Customer and Distributor Relationships [Member]
Trademarks and trade names
Trademarks and Trade Names [Member]
Leasehold interest
Lease Agreements [Member]
Backlog
Order or Production Backlog [Member]
Capitalized Software
Computer Software, Intangible Asset [Member]
Income Statement Location [Axis]
Income Statement Location [Domain]
Product revenue
Sales Revenue, Goods, Net [Member]
Included as cost of product revenue
Included As Cost Of Product Revenue [Member]
Included As Cost Of Product Revenue [Member]
Included as operating expense
Included As Operating Expense [Member]
Included As Operating Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-Lived Intangible Assets [Line Items]
Number of operating segments
Number of Operating Segments
Goodwill
Carrying value of intangible assets
Intangible Assets, Net (Excluding Goodwill)
Indefinite-lived intangible assets
Indefinite-Lived Intangible Assets (Excluding Goodwill)
Amortization expenses
Amortization of Intangible Assets
Weighted average useful life of acquired intangible assets
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Percentage of common stock price for employees
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Communications Business
Communications Business [Member]
Communications Business [Member]
Award Type [Axis]
Award Type [Axis]
Equity Award [Domain]
Equity Award [Domain]
Replacement Awards
Stock Compensation Plan [Member]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Total equity consideration
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable
Estimated Purchase Price
Business Combination, Consideration Transferred
Estimated fair value of assets acquired and liabilities assumed:
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents
Accounts receivable
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables
Inventories
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory
Prepaid expenses and other assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets
Property, plant and equipment
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment
Deferred income taxes
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent
Intangible assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill
Other assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets
Accounts payable
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable
Accrued compensation
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Compensation
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Compensation
Accrued other
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other
Deferred revenue
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue
Other long-term liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other
Accrued retirement benefits
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Retirement Benefits
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Retirement Benefits
Deferred tax liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Current
Class of Treasury Stock [Table]
Class of Treasury Stock [Table]
Share Repurchase Program, April 2014
Share Repurchase Program, April 2014 [Member]
Share Repurchase Program, April 2014 [Member]
Share Repurchase Program, May 2015
Share Repurchase Program, May 2015 [Member]
Share Repurchase Program, May 2015 [Member]
Equity, Class of Treasury Stock [Line Items]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount up to
Stock Repurchase Program, Authorized Amount
Shares repurchased during the period (in shares)
Treasury Stock, Shares, Acquired
Shares repurchased during the period, value
Payments for Repurchase of Common Stock
Stock remaining to be purchased (in shares)
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased
Income Statement [Abstract]
Revenue:
Revenues [Abstract]
Product
Sales Revenue, Goods, Net
Service
Sales Revenue, Services, Net
Total revenue
Cost of revenue:
Cost of Revenue [Abstract]
Product (related party balances of $4,577 and $0, respectively)
Cost of Goods Sold
Service (related party balances of $190 and $0, respectively)
Cost of Services
Total cost of revenue
Cost of Revenue
Gross profit
Gross Profit
Operating expenses:
Operating Expenses [Abstract]
Research and development (related party balances of $1,026 and $0, respectively)
Research and Development Expense
Sales and marketing (related party balances of $1,600 and $0, respectively)
Selling and Marketing Expense
General and administrative (related party balances of $1,504 and $0, respectively)
General and Administrative Expense
Amortization of acquired intangible assets
Total operating expenses
Operating Expenses
Income (loss) from operations
Operating Income (Loss)
Interest and other income (expense), net:
Nonoperating Income (Expense) [Abstract]
Interest income
Investment Income, Interest
Interest expense
Interest Expense
Other expense, net
Other Nonoperating Income (Expense)
Total interest and other expense, net
Nonoperating Income (Expense)
Income (loss) before income tax expense (benefit)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Income tax expense (benefit)
Income Tax Expense (Benefit)
Net income (loss)
Weighted average common shares outstanding used in computing:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Net income (loss) per share - basic (in shares)
Net income (loss) per share - diluted (in shares)
Managing period of hedging forecasted cash flows for operating expenses denominated in foreign currencies
Hedging Forecasted Cash Flows For Operating Expenses Denominated In Foreign Currencies Managed In Months
Hedging Forecasted Cash Flows For Operating Expenses Denominated In Foreign Currencies Managed In Months
Contract maturity period
Contract Maturing Over Next Months
Contract Maturing Over Next Months
NET INCOME (LOSS) PER SHARE
Earnings Per Share [Text Block]
INVENTORIES
Inventory Disclosure [Text Block]
Number of reportable segments
Number of Reportable Segments
Statement of Financial Position [Abstract]
Affiliated Entity
Affiliated Entity [Member]
Accounts receivable, allowance for doubtful accounts
Allowance for Doubtful Accounts Receivable, Current
Related party prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Related party accounts payable
Accounts Payable, Current
Preferred stock, par value (in USD per share)
Preferred Stock, Par or Stated Value Per Share
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding
Common stock, par value (in USD per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding
Treasury stock, shares (in shares)
Treasury Stock, Shares
Fair Value, Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Contingently Returnable Consideration
Contingently Returnable Consideration [Member]
Contingently Returnable Consideration [Member]
Fair Value, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
[Line Items] for Fair Value, Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value
Increase in fair value and accretion expense (included within research and development expense)
Payments made
Payments Of Contingent Consideration
Payments Of Contingent Consideration
Balance at end of period
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Payment received
Increase (Decrease) Contingent Consideration, Asset
Increase (Decrease) Contingent Consideration, Asset
Balance at end of period
GOODWILL AND INTANGIBLE ASSETS
Goodwill and Intangible Assets Disclosure [Text Block]
Other comprehensive income (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
Changes in market value of investments:
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax [Abstract]
Changes in unrealized gains (losses)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Total net change in market value of investments
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Changes in market value of derivatives:
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Changes in market value of derivatives, net of (benefits) taxes of ($19), and $4, respectively
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Reclassification adjustment for net gains included in net income (loss), net of taxes of $8, $460, respectively
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax
Total net change in market value of derivatives
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Total comprehensive income (loss)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Recent Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017 (remaining nine months)
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year
2018
Finite-Lived Intangible Assets, Amortization Expense, Year Two
2019
Finite-Lived Intangible Assets, Amortization Expense, Year Three
2020
Finite-Lived Intangible Assets, Amortization Expense, Year Four
2021
Finite-Lived Intangible Assets, Amortization Expense, Year Five
Thereafter
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
Net
Finite-Lived Intangible Assets, Net
ACQUISITIONS
Business Combination Disclosure [Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Table]
Commitments And Contingencies Disclosure [Table]
Commitments and Contingencies Disclosure [Table]
Present value of future consideration
Present Value Of Future Consideration [Member]
Present Value of Future Consideration [Member]
Danaher
Danaher [Member]
Danaher [Member]
Commitments and Contingencies Disclosure [Line Items]
Commitments And Contingencies Disclosure [Line Items]
Commitments and Contingencies Disclosure [Line Items]
Number of contingent liabilities recorded
Business Combination, Contingent Consideration, Number of Contingent Liabilities Recorded
Business Combination, Contingent Consideration, Number of Contingent Liabilities Recorded
Fair value of contingent liability
Summary of Purchase Price Allocation
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Schedule of Fair value of Acquired Identifiable Intangible Assets and Related Estimates of Useful Lives
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
Schedule of Pro Forma Results of Consolidated Statement of Operations
Business Acquisition, Pro Forma Information [Table Text Block]
Assets
Assets [Abstract]
Current assets:
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Marketable securities
Marketable Securities, Current
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $6,212 and $5,069 at June 30, 2016 and March 31, 2016, respectively
Accounts Receivable, Net, Current
Inventories and deferred costs
Inventory, Net
Prepaid income taxes
Prepaid Taxes
Prepaid expenses and other current assets (related party balances of $38,357 and $44,161, respectively)
Total current assets
Assets, Current
Fixed assets, net
Property, Plant and Equipment, Net
Intangible assets, net
Deferred income taxes
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent
Long-term marketable securities
Marketable Securities, Noncurrent
Other assets
Other Assets, Noncurrent
Total assets
Assets
Liabilities and Stockholders’ Equity
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Accounts payable (related party balances of $3,943 and $5,893, respectively)
Accrued compensation
Employee-related Liabilities, Current
Accrued other
Other Accrued Liabilities, Current
Income taxes payable
Accrued Income Taxes, Current
Deferred revenue and customer deposits
Deferred Revenue, Current
Total current liabilities
Liabilities, Current
Other long-term liabilities
Other Liabilities, Noncurrent
Deferred tax liability
Deferred Tax Liabilities, Gross, Noncurrent
Accrued long-term retirement benefits
Deferred Compensation Liability, Classified, Noncurrent
Long-term deferred revenue and customer deposits
Deferred Revenue, Noncurrent
Long-term debt
Long-term Debt, Excluding Current Maturities
Contingent liabilities
Business Combination, Contingent Consideration, Liability, Noncurrent
Total liabilities
Liabilities
Commitments and contingencies (Note 12)
Commitments and Contingencies
Stockholders’ equity:
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, $0.001 par value:
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
5,000,000 shares authorized; no shares issued or outstanding at June 30, 2016 and March 31, 2016
Preferred Stock, Value, Issued
Common stock, $0.001 par value:
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
150,000,000 shares authorized; 114,503,040 and 114,495,614 shares issued and 91,992,604 and 94,088,469 shares outstanding at June 30, 2016 and March 31, 2016, respectively
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Treasury stock at cost, 22,510,436 and 20,407,145 shares at June 30, 2016 and March 31, 2016, respectively
Treasury Stock, Value
Retained earnings
Retained Earnings (Accumulated Deficit)
Total stockholders’ equity
Stockholders' Equity Attributable to Parent
Total liabilities and stockholders’ equity
Liabilities and Equity
PENSION BENEFIT PLANS
Pension and Other Postretirement Benefits Disclosure [Text Block]
Income Tax Disclosure [Abstract]
INCOME TAXES
Income Tax Disclosure [Text Block]
Equity Interest Type [Axis]
Equity Interest Type [Axis]
Equity Interest Issued or Issuable, Type [Domain]
Equity Interest Issued or Issuable, Type [Domain]
Common stock
Common Stock [Member]
Newco
Potomac Holding LLC [Member]
Potomac Holding LLC [Member]
Shares issued in business acquisition (in shares)
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares
Share price (in dollars per share)
Share Price
Schedule of Net Periodic Pension Costs of Noncontributory Defined Benefit Pension Plans
Schedule of Net Benefit Costs [Table Text Block]
FAIR VALUE MEASUREMENTS
Fair Value Disclosures [Text Block]
Restructuring Plan [Axis]
Restructuring Plan [Axis]
Restructuring Plan [Domain]
Restructuring Plan [Domain]
Q3 FY2016 Plan
Q3 FY2016 Plan [Member]
Q3 FY2016 Plan [Member]
Q1 FY2017 Plan
Q1 FY2017 Plan [Member]
Q1 FY2017 Plan [Member]
Balance at March 31, 2016
Restructuring Reserve
Restructuring charges to operations
Cash payments
Payments for Restructuring
Other adjustments
Restructuring Reserve, Accrual Adjustment
Balance at June 30, 2016
Available-for-sale securities:
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value
Due after 1 year through 5 years
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value
Fair Value
Available-for-sale Securities
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Level 1
Fair Value, Inputs, Level 1 [Member]
Level 2
Fair Value, Inputs, Level 2 [Member]
Investment Type [Axis]
Investment Type [Axis]
Investment Type Categorization [Domain]
Investments [Domain]
U.S. government and municipal obligations
US Government Corporations and Agencies Securities [Member]
Commercial paper
Commercial Paper [Member]
Corporate bonds
Corporate Debt 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]
ASSETS:
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Marketable securities
Derivative financial instruments
Derivative Asset
Total assets
Assets, Fair Value Disclosure
LIABILITIES:
Liabilities, Fair Value Disclosure [Abstract]
Contingent purchase consideration
Derivative financial instruments
Derivative Liability
Total liabilities
Financial and Nonfinancial Liabilities, Fair Value Disclosure
Geographical [Axis]
Number of employees participating in noncontributory defined benefit pension plans
Defined Benefit Plan, Number Of Employees Covered
Defined Benefit Plan, Number Of Employees Covered
Contributions to defined benefit pension plans
Defined Benefit Plan, Contributions by Employer
Expected cash contribution requirements for defined benefit pension plans, less than
Defined Benefit Plan, Expected Contributions in Current Fiscal Year
Expense for all defined benefit pension and defined contribution plans
Pension and Other Postretirement Benefit Expense
Risks and Uncertainties [Abstract]
Concentration Risk [Table]
Concentration Risk [Table]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Customer Concentration Risk
Customer Concentration Risk [Member]
Credit Concentration Risk
Credit Concentration Risk [Member]
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
Indirect Customer
Indirect Customer [Member]
Indirect Customer [Member]
Direct Customer
Direct Customer [Member]
Direct Customer [Member]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Accounts receivable
Accounts Receivable [Member]
Sales Revenue
Sales Revenue [Member]
Sales Revenue [Member]
Concentration Risk [Line Items]
Concentration Risk [Line Items]
Number of customers contributing to more than 10%
Number of Major Customers
Number of Major Customers
Schedule of Restructuring Liability
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
RELATED PARTY TRANSACTIONS
Related Party Transactions Disclosure [Text Block]
Raw materials
Inventory, Raw Materials, Gross
Work in process
Inventory, Work in Process, Gross
Finished goods
Inventory, Finished Goods, Gross
Total inventories
FIFO Inventory Amount
Schedule of Financial Assets and Liabilities
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Schedule of Reconciliation of Changes in Fair Value of Level III Financial Assets
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
RESTRUCTURING CHARGES
Restructuring and Related Activities Disclosure [Text Block]
Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table]
Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table]
Developed technology
Developed Technology Rights [Member]
Customer relationships
Customer Relationships [Member]
Definite lived trademark and trade names
Fair value of finite-lived intangible assets
Finite-lived Intangible Assets Acquired
Useful life of identifiable finite-lived intangible assets
Finite-Lived Intangible Asset, Useful Life
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
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 revenue
Cost Of Product Revenue [Member]
Cost Of Product Revenue [Member]
Cost of service revenue
Cost Of Service Revenue [Member]
Cost Of Service Revenue [Member]
General and administrative
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense
Allocated Share-based Compensation Expense
CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS
Concentration Risk Disclosure [Text Block]
Business Combination, Separately Recognized Transactions [Axis]
Business Combination, Separately Recognized Transactions [Axis]
Business Combination, Separately Recognized Transactions [Domain]
Business Combination, Separately Recognized Transactions [Domain]
Post combination compensation expense, Danaher equity awards
Post Combination Compensation Expense, Danaher Equity Awards [Member]
Post Combination Compensation Expense, Danaher Equity Awards [Member]
Contingently returnable consideration, cash retention award
Contingently Returnable Consideration, Cash Retention Award [Member]
Contingently Returnable Consideration, Cash Retention Award [Member]
Cash retention award
Cash Retention Award [Member]
Cash Retention Award [Member]
Vesting [Axis]
Vesting [Axis]
Vesting [Domain]
Vesting [Domain]
Vesting after August 4, 2015
Share-based Compensation Award, Tranche Two [Member]
Accrued compensation
Employee Related Liabilities, Current [Member]
Employee Related Liabilities, Current [Member]
Total equity consideration
Increase (decrease) in accounts receivable
Increase in inventory
Decrease in prepaid expenses and other assets
Increase in property, plant and equipment
Increase (decrease) in accounts payable
Increase (decrease) in accrued expenses
Increase (decrease) in deferred revenue
Post combination compensation expense
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized
Percent of cancelled Danaher equity awards replaced
Business Combination, Separately Recognized Transactions, Equity Awards, Forfeited, Percent
Business Combination, Separately Recognized Transactions, Equity Awards, Forfeited, Percent
Receivable from Danaher
Business Combination, Separately Recognized Transactions, Assets Recognized
Cash liability
Business Combination, Separately Recognized Transactions, Liabilities Recognized
Acquisition related costs
Business Combination, Acquisition Related Costs
Revenues
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual
Net loss
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual
Document and Entity Information [Abstract]
Document and Entity Information [Abstract]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Document Type
Document Type
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
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Statement of Cash Flows [Abstract]
Cash flows from operating activities:
Net Cash Provided by (Used in) Continuing Operations [Abstract]
Adjustments to reconcile net income (loss) to cash provided by operating activities, net of the effects of acquisitions:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization
Depreciation, Depletion and Amortization
Loss on disposal of fixed assets
Gain (Loss) on Disposition of Property Plant Equipment
Deal-related compensation expense and accretion charges
Acquisition Related Compensation Expense And Accretion Charges
Acquisition related Compensation Expense And Accretion Charges
Share-based compensation expense associated with equity awards
Share-based Compensation
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Other losses
Other Noncash Income (Expense)
Changes in assets and liabilities
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable and unbilled costs
Increase (Decrease) in Accounts Receivable
Due from related party
Increase (Decrease) in Due from Related Parties
Inventories
Increase (Decrease) in Inventories
Prepaid expenses and other assets
Increase (Decrease) in Prepaid Expense and Other Assets
Accounts payable
Increase (Decrease) in Accounts Payable
Accrued compensation and other expenses
Increase (Decrease) in Employee Related Liabilities
Due to related party
Increase (Decrease) in Due to Related Parties
Income taxes payable
Increase (Decrease) in Income Taxes Payable
Deferred revenue
Increase (Decrease) in Deferred Revenue
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]
Proceeds from maturity of marketable securities
Proceeds from Sale and Maturity of Marketable Securities
Purchase of fixed assets
Payments to Acquire Property, Plant, and Equipment
Purchase of intangible assets
Payments to Acquire Intangible Assets
Increase in deposits
Payments for (Proceeds from) Other Deposits
Collection of contingently returnable consideration
Capitalized software development costs
Payments to Develop Software
Net cash provided by (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]
Treasury stock repurchases
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities, Continuing Operations
Effect of exchange rate changes on cash and cash equivalents
Effect of Exchange Rate on Cash and Cash Equivalents
Net increase (decrease) in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period
Supplemental disclosures:
Supplemental Cash Flow Information [Abstract]
Non-cash transactions:
Non Cash Transaction [Abstract]
Non Cash Transaction [Abstract]
Transfers of inventory to fixed assets
Transfers From Inventory To Fixed Assets
Transfers from inventory to fixed assets
Additions to property, plant and equipment included in accounts payable
Capital Expenditures Incurred but Not yet Paid
CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES
Cash and Cash Equivalents Disclosure [Text Block]
Related party product
Related party service
Related party research and development
Related party selling and marketing
Related party general and administrative expense
Cash, Cash Equivalents and Marketable Securities [Table]
Cash Cash Equivalents And Marketable Securities [Table]
Cash, Cash Equivalents and Marketable Securities [Table]
Short-term marketable securities
Short Term Marketable Securities [Member]
Short-term Marketable Securities [Member]
Long-term marketable securities
Long Term Marketable Securities [Member]
Long-term Marketable Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost
Available-for-sale Securities, Amortized Cost Basis
Unrealized Gains
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax
Fair Value
Summary of Share-Based Compensation Expense
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
Effective tax rate
Effective Income Tax Rate Reconciliation, Percent
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Developed technology
Customer relationships
Distributor relationships
Distributor Relationships [Member]
Distributor Relationships [Member]
Core technology
Core Technology [Member]
Core Technology [Member]
Net beneficial leases
Above Market Leases [Member]
Non-compete agreements
Noncompete Agreements [Member]
Other
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Cost
Finite-Lived Intangible Assets, Gross
Accumulated Amortization
Finite-Lived Intangible Assets, Accumulated Amortization