Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Intrinsic Value of Options Exercised and Fair Value of Options Vested (Detail)

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Description of Stock Plans - Intrinsic Value of Options Exercised and Fair Value of Options Vested (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement [Abstract]      
Total fair value of options vested $ 4,816 $ 2,577 $ 1,977
Total intrinsic value of options exercised $ 97,603 $ 10,890 $ 603