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Stockholders' Equity - Change in Number of Shares of Common Stock Outstanding (Detail) - shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares outstanding, beginning balance 42,323,305 42,620,750 41,915,000
Purchase of treasury stock 0 (581,140) (726,347)
Shares issued in acquisition (in shares)     1,177,630
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes 429,715 283,695 254,467
Shares outstanding, ending balance 42,753,020 42,323,305 42,620,750