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Treasury Stock - Summary of Share Repurchases and Cumulatively Since Inception of Authorization (Detail) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Equity [Abstract]      
Shares repurchased 582,159 249,245 745,575
Cost $ 35,167,000 $ 11,187,000 $ 27,999,000
Average price $ 60.41 $ 44.88 $ 37.56
Shares repurchased, Cumulative 35,463,238    
Cost, Cumulative $ 466,156,000    
Average price, Cumulative $ 13.14