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Stock Plans - Employee Stock Purchase plan (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 26,403	$ 23,615	$ 52,807	$ 47,339
Unrecognized stock-based compensation expense	$ 131,201		$ 131,201
ESPP
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%		10.00%
Maximum amount of stock purchasable by employees within a calendar year			$ 25
Number of shares purchased by employees (in shares)			68	96
Proceeds received			$ 5,486	$ 5,164
Compensation expense			1,701	$ 1,662
Unrecognized stock-based compensation expense	$ 1,569		$ 1,569

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