Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Assets:
Trading investments for deferred compensation plan	$ 24,559	$ 20,085
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	29,000	23,284
Fair Value, Measurements, Recurring \| Level 1
Assets:
Cash equivalents	301,090	564,952
Trading investments for deferred compensation plan	24,559	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	233	846
Fair Value, Measurements, Recurring \| Level 1 \| Common stock
Assets:
Trading investments for deferred compensation plan	1,388	0
Fair Value, Measurements, Recurring \| Level 1 \| Money market funds
Assets:
Trading investments for deferred compensation plan	8,650	7,147
Fair Value, Measurements, Recurring \| Level 1 \| Mutual funds
Assets:
Trading investments for deferred compensation plan	14,288	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	1,836	129
Liabilities:
Currency exchange derivative liabilities included in accrued and other current liabilities	130	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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