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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Share-Based Payment Arrangement [Abstract]      
Number of Shares, Outstanding Options at Beginning of Year 456,849 708,501 1,160,091
Number of Shares, Granted 56,621 11,316 187,121
Number of Shares, Exercised (73,343) (247,578) (623,617)
Number of Shares, Cancelled (3,178) (15,390) (15,094)
Number of Shares, Outstanding Options at End of Year 436,949 456,849 708,501
Number of Shares, Options Exercisable at End of Year 339,043 314,624 416,817
Weighted-Average Exercise Price, Outstanding Options at Beginning of Year $ 83.81 $ 83.85 $ 80.36
Weighted-Average Exercise Price, Granted 125.90 140.42 61.92
Weighted-Average Exercise Price, Exercised 80.19 86.97 70.57
Weighted-Average Exercise Price, Cancelled 109.15 76.63 92.51
Weighted-Average Exercise Price, Outstanding Options at End of Year 89.69 83.81 83.85
Weighted-Average Fair Value of Options Granted During the Year $ 48.36 $ 49.18 $ 22.68