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Fair Value Measurements (Financial Assets and Liabilities, Classified by Level) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	$ 15,043	$ 14,836
Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	448,742	10,000
Trading investments for deferred compensation plan	15,043	14,836
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	2,813	3,467
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	12,230	11,369
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	9,908	0
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
Foreign exchange derivative assets	0	0
Currency exchange 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
Foreign exchange derivative assets	48	10
Currency exchange derivative liabilities included in accrued and other current liabilities	443	1,132
Foreign exchange contract | Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Foreign exchange derivative assets	0	0
Currency exchange derivative liabilities included in accrued and other current liabilities	$ 0	$ 0

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

+ References

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-Topic 805
-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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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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