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Stock Option Activity (Detail)
 6 Months Ended
Sep. 30, 2023
$ / shares
shares
Share-Based Payment Arrangement [Abstract]  
Number of Shares, Outstanding Options at March 31, 2023 | shares 436,949
Number of Shares, Granted | shares 5,558
Number of Shares, Exercised | shares (130,053)
Number of Shares, Cancelled | shares (1,000)
Number of Shares, Outstanding Options at September 30, 2023 | shares 311,454
Number of Shares, Options Exercisable at September 30, 2023 | shares 216,868
Weighted-Average Exercise Price, Outstanding Options at March 31, 2023 | $ / shares $ 89.69
Weighted-Average Exercise Price, Granted | $ / shares 172.62
Weighted-Average Exercise Price, Exercised | $ / shares 88.18
Weighted-Average Exercise Price, Cancelled | $ / shares 73.37
Weighted-Average Exercise Price, Outstanding Options at September 30, 2023 | $ / shares 91.85
Weighted Average Fair Value of Options Granted During the Year | $ / shares $ 69.84