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Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Assets:
Trading investments for deferred compensation plan	$ 20,645	$ 17,748
Fair Value, Measurements, Recurring | Level 1
Assets:
Cash equivalents	304,627	492,535
Trading investments for deferred compensation plan	20,645	17,748
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Assets:
Currency exchange derivative assets included in other current assets	0	0
Liabilities:
Currency exchange derivative liabilities included in accrued and other current liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Assets:
Trading investments for deferred compensation plan	4,252	2,881
Fair Value, Measurements, Recurring | Level 1 | Mutual funds
Assets:
Trading investments for deferred compensation plan	16,393	14,867
Fair Value, Measurements, Recurring | Level 2
Assets:
Cash equivalents	0	0
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Assets:
Currency exchange derivative assets included in other current assets	244	0
Liabilities:
Currency exchange derivative liabilities included in accrued and other current liabilities	50	34
Fair Value, Measurements, Recurring | Level 2 | Money market funds
Assets:
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 2 | Mutual funds
Assets:
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 3
Assets:
Cash equivalents	0	0
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Assets:
Currency exchange derivative assets included in other current assets	0	0
Liabilities:
Currency exchange derivative liabilities included in accrued and other current liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Money market funds
Assets:
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Level 3 | Mutual funds
Assets:
Trading investments for deferred compensation plan	$ 0	$ 0

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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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Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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