Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Stock Compensation Expense (Detail)

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Description of Stock Plans - Stock Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
General and administrative      
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]      
Allocated Stock compensation expense $ 5,876 $ 3,353 $ 2,531