Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Assets:
Trading investments for deferred compensation plan	$ 24,056	$ 20,085
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	537	23,284
Fair Value, Measurements, Recurring \| Level 1
Assets:
Cash equivalents	465,838	564,952
Trading investments for deferred compensation plan	24,056	20,085
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	0	0
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 \| Cash
Assets:
Trading investments for deferred compensation plan	75	846
Fair Value, Measurements, Recurring \| Level 1 \| Common stock
Assets:
Trading investments for deferred compensation plan	1,544	0
Fair Value, Measurements, Recurring \| Level 1 \| Money market funds
Assets:
Trading investments for deferred compensation plan	7,147	7,147
Fair Value, Measurements, Recurring \| Level 1 \| Mutual funds
Assets:
Trading investments for deferred compensation plan	15,290	12,092
Fair Value, Measurements, Recurring \| Level 2
Assets:
Cash equivalents	0	0
Trading investments for deferred compensation plan	0	0
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	0	0
Fair Value, Measurements, Recurring \| Level 2 \| Foreign exchange contracts
Assets:
Currency exchange derivative assets included in other current assets	0	129
Liabilities:
Currency exchange derivative liabilities included in accrued and other current liabilities	4,523	719
Fair Value, Measurements, Recurring \| Level 2 \| Cash
Assets:
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring \| Level 2 \| Common stock
Assets:
Trading investments for deferred compensation plan	0	0
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
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	0	23,284
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 \| Cash
Assets:
Trading investments for deferred compensation plan	0	0
Fair Value, Measurements, Recurring \| Level 3 \| Common stock
Assets:
Trading investments for deferred compensation plan	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 liability recognized arising from contingent consideration in a business combination.

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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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