Common Stock and Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Apr. 30, 2022	Dec. 31, 2014	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Class of Stock [Line Items]
Stock-based compensation expense			$ 153,039	$ 135,143	$ 99,536
Shares available for issuance (in shares)			22,226,000	21,106,000
Weighted-average grant-date fair value of options granted (in usd per share)			$ 0.00	$ 26.51	$ 30.67
Intrinsic value of options exercised			$ 39,003
Total fair value of RSUs vested			$ 99,300	$ 107,100	$ 63,300
Closing stock price reported (in usd per share)			$ 66.88
Unrecognized stock-based compensation cost related to outstanding unvested stock awards			$ 9,800
Stock-based compensation cost expected to be recognized over weighted-average period			1 year 9 months 18 days
Expected to vest unrecognized stock-based compensation cost related to outstanding unvested stock options			$ 251,700
Stock-based compensation cost expected to be recognized over weighted-average period			5 years 7 months 6 days
Unvested Stock Options
Class of Stock [Line Items]
Stock-based compensation cost expected to be recognized over weighted-average period			2 years 6 months
Performance Units (PSUs)
Class of Stock [Line Items]
Shares available for issuance (in shares)			320,000	112,000
Vested (in shares)			33,000
Intrinsic value of options exercised			$ 39,000	$ 20,600	$ 23,800
Expected to vest unrecognized stock-based compensation cost related to outstanding unvested stock options			$ 10,000
Stock-based compensation cost expected to be recognized over weighted-average period			1 year 9 months 18 days
Performance Units (PSUs) | Subsequent Event
Class of Stock [Line Items]
Vested (in shares)	129,991
Performance Units (PSUs) | Minimum
Class of Stock [Line Items]
Vesting percentage			0.00%
Performance Units (PSUs) | Maximum
Class of Stock [Line Items]
Vesting percentage			200.00%
Performance Units (PSUs) | Share-based Payment Arrangement, Tranche One
Class of Stock [Line Items]
Vesting period			1 year
Performance Units (PSUs) | Share-based Payment Arrangement, Tranche Two
Class of Stock [Line Items]
Vesting period			2 years
Performance Units (PSUs) | Share-based Payment Arrangement, Tranche Three
Class of Stock [Line Items]
Vesting period			3 years
ESPP shares
Class of Stock [Line Items]
Shares reserved for issuance under plan (in shares)		1,000,000
Additional shares available for issuance under the plan (in shares)		500,000
Percentage of common stock shares increased under the plan		1.00%
Common stock purchased under Employee Stock Purchase Plan (in shares)			200,000	300,000	300,000
Stock-based compensation expense			$ 4,200	$ 5,500	$ 5,300
Shares available for issuance (in shares)			2,987,542
Purchase period			6 months
2008 Equity Incentive Plan
Class of Stock [Line Items]
Shares available for issuance (in shares)			0
2014 Equity Incentive Plan
Class of Stock [Line Items]
Shares reserved for issuance under plan (in shares)		5,000,000
Shares available for issuance (in shares)			13,904,194
Shares available for grant under plan (in shares)		5,184,878
Percentage of shares of company's common stock outstanding for increase in shares reserved for issuance under stock plan		5.00%