Leases - Summary of Lease, Cost (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
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| Lease, Cost [Abstract] | |||||
| Operating lease cost, net | [1] | $ 13,614 | $ 10,999 | $ 10,484 | |
| Variable lease cost | 5,809 | 4,705 | 2,506 | ||
| Total lease cost | $ 19,423 | $ 15,704 | $ 12,990 | ||
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