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Treasury Stock - Summary of Share Repurchases and Cumulatively Since Inception of Authorization (Detail) - USD ($)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Equity [Abstract]      
Shares repurchased 598,241 566,073 367,961
Cost $ 93,675,000 $ 90,085,000 $ 32,671,000
Average price $ 156.58 $ 159.14 $ 88.79
Shares repurchased, Cumulative 37,817,866    
Cost, Cumulative $ 748,195,000    
Average price, Cumulative $ 19.78