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Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	$ 17,583	$ 15,043
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	286,074	448,742
Time Deposits	0	0
Trading investments for deferred compensation plan	17,583	15,043
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency exchange derivative assets included in other current assets	0	0
Currency exchange derivative liabilities included in accrued and other current liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	3,110	2,813
Fair Value, Measurements, Recurring | Level 1 | Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	14,473	12,230
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Time Deposits	6,789	0
Trading investments for deferred compensation plan	0	0
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities	0	0
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency exchange derivative assets included in other current assets	165	48
Currency exchange derivative liabilities included in accrued and other current liabilities	107	443
Fair Value, Measurements, Recurring | Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 2 | Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Time Deposits	0	0
Trading investments for deferred compensation plan	0	0
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities	0	9,908
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency exchange derivative assets included in other current assets	0	0
Currency exchange derivative liabilities included in accrued and other current liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 3 | Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	$ 0	$ 0

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Amount of time deposit liabilities, including certificates of deposit.

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