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Stock Plans - Employee Stock Purchase Plan (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	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
Unrecognized stock-based compensation expense	$ 120,658
Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price as a percentage of fair market value	85.00%
Length of offering period (in months)	6 months
Maximum employee payroll percent deduction of salary	10.00%
Maximum amount of stock purchasable by employees within a calendar year	$ 25
Number of shares purchased by employees (in shares)	272	273
Proceeds received	$ 9,812	$ 9,670
Compensation expense	3,417	$ 2,939	$ 3,080
Unrecognized stock-based compensation expense	$ 1,139

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Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Purchases Per Employee, Amount

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The cash inflow associated with the amount received from the stock plan during the period.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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