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Stock Plans - Employee Stock Purchase plan (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 31,463	$ 24,602	$ 84,270	$ 71,941
Unrecognized stock-based compensation expense	$ 174,094		$ 174,094
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			2,746	$ 2,391
Unrecognized stock-based compensation expense	$ 523		$ 523

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