Common Stock and Stock Plans - Summary of PSUs, Employee Stock Options and Employee Stock Purchase Plan Weighted Average Assumptions (Detail)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	64.50%	54.20%	46.40%
Risk-free interest rate	3.50%	4.20%	3.40%
Dividend yield	0.00%	0.00%	0.00%
Expected life	5 years	5 years	5 years
Market-based Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility		56.40%	49.90%
Risk-free interest rate		4.40%	3.80%
Dividend yield		0.00%	0.00%
Expected life		4 years 7 months 6 days	5 years
Market Condition Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	64.70%
Risk-free interest rate	4.30%
Dividend yield	0.00%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	97.30%	66.60%	60.50%
Risk-free interest rate	4.60%	5.30%	3.40%
Dividend yield	0.00%	0.00%	0.00%
Expected life	6 months	6 months	6 months