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Common Stock and Stock Plans - Summary of Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Stock-based compensation expense before taxes | $ 86,553 | $ 79,599 | $ 68,545
Related income tax benefits | (20,388) | (18,824) | (16,278)
Stock-based compensation expense, net of taxes | $ 66,165 | $ 60,775 | $ 52,267

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