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Stock Plans - Impact on Stock Compensation Expense for Changes in Senior Leadership (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 01, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 84,833	$ 65,888	$ 80,487
Restricted stock awards and performance based awards | Chief executive officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period				10 years
Original period from last date of employment exercisable	30 days
Compensation expense				$ 12,157

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Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Original Period From Last Date Of Employment Exercisable

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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