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Fair Value Measurements (Financial Assets and Liabilities, Classified by Level) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	$ 17,748	$ 15,043
Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	492,535	448,742
Trading investments for deferred compensation plan	17,748	15,043
Acquisition-related contingent consideration included in accrued and other current liabilities and other non-current liabilities	0	0
Level 1 | Money market funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	2,881	2,813
Level 1 | Mutual funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	14,867	12,230
Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	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	0
Level 2 | Money market funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Level 2 | Mutual funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	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
Level 3 | Money market funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Level 3 | Mutual funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Foreign exchange contract | Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Currency derivative assets included in other current assets	0	0
Currency derivative liabilities included in accrued and other current liabilities	0	0
Foreign exchange contract | Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Currency derivative assets included in other current assets	0	48
Currency derivative liabilities included in accrued and other current liabilities	34	443
Foreign exchange contract | Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Currency derivative assets included in other current assets	0	0
Currency derivative liabilities included in accrued and other current liabilities	$ 0	$ 0

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- Definition

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

+ References

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-Name Accounting Standards Codification
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-SubTopic 30
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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, 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 investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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