| Description of Stock Plans - Schedule of Options Vested and Intrinsic Value of Options Exercised (Details) - USD ($) $ in Thousands | 9 Months Ended | |
|---|---|---|
| Dec. 31, 2020 | Dec. 31, 2019 | |
| Share-based Payment Arrangement [Abstract] | ||
| Total fair value of options vested | $ 3,340 | $ 2,028 | 
| Total intrinsic value of options exercised | $ 52,657 | $ 10,364 | 
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- References No definition available. 
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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