Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Assets:
Trading investments for deferred compensation plan	$ 28,375	$ 24,809
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	10,570	6,967
Contingent consideration for business acquisition included in other non-current liabilities	3,971	0
Fair Value, Measurements, Recurring \| Level 1
Assets:
Cash equivalents	402,219	669,759
Trading investments for deferred compensation plan	28,375	24,809
Currency exchange derivative assets included in other current assets	0	0
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	0	0
Contingent consideration for business acquisition included in other non-current liabilities	0	0
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	63	31
Fair Value, Measurements, Recurring \| Level 1 \| Common stock
Assets:
Trading investments for deferred compensation plan	1,850	1,569
Fair Value, Measurements, Recurring \| Level 1 \| Money market funds
Assets:
Trading investments for deferred compensation plan	7,661	6,734
Fair Value, Measurements, Recurring \| Level 1 \| Mutual funds
Assets:
Trading investments for deferred compensation plan	18,801	16,475
Fair Value, Measurements, Recurring \| Level 2
Assets:
Cash equivalents	0	0
Trading investments for deferred compensation plan	0	0
Currency exchange derivative assets included in other current assets	2,153	5,452
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	0	0
Contingent consideration for business acquisition included in other non-current liabilities	0	0
Currency exchange derivative liabilities included in accrued and other current liabilities	109	100
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
Currency exchange derivative assets included in other current assets	0	0
Liabilities:
Contingent consideration for business acquisition included in accrued and other current liabilities	10,032	6,430
Contingent consideration for business acquisition included in other non-current liabilities	3,971	0
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, expected to be settled within one year or the normal operating cycle, if longer.

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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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