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Treasury Stock - Summary of Share Repurchases and Cumulatively Since Inception of Authorization (Detail) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Equity [Abstract]      
Shares repurchased 367,961 822,353 582,159
Cost $ 32,671,000 $ 65,608,000 $ 35,167,000
Average price $ 88.79 $ 79.78 $ 60.41
Shares repurchased, Cumulative 36,653,552    
Cost, Cumulative $ 564,435,000    
Average price, Cumulative $ 15.40