Fair Value Measurements (Financial Assets and Liabilities, Classified by Level) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	$ 20,085	$ 20,363
Fair value of contingent consideration (earn-out)	23,284	0
Level 1 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	564,952	496,434
Trading investments for deferred compensation plan	20,085	20,363
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
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
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
Fair value of contingent consideration (earn-out)	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	129	455
Fair value of contingent consideration (earn-out)	0	0
Currency derivative liabilities included in accrued and other current liabilities	719	36
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
Fair value of contingent consideration (earn-out)	23,284	0
Currency derivative liabilities included in accrued and other current liabilities	0	0
Cash \| Level 1 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	846	0
Cash \| Level 2 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Cash \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Money Market Funds \| Level 1 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	7,147	4,080
Money Market Funds \| Level 2 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Money Market Funds \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Mutual Funds \| Level 1 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	12,092	16,283
Mutual Funds \| Level 2 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	0	0
Mutual Funds \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Trading investments for deferred compensation plan	$ 0	$ 0

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

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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 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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