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Summary of Activity for Nonvested Restricted Shares (Detail) - Restricted Stock [Member] - $ / shares
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Shares, Nonvested Restricted Stock at Beginning of Year 258,779 267,090 233,120
Number of Shares, Granted 111,230 113,414 179,377
Number of Shares, Vested (147,678) (116,507) (136,280)
Number of Shares, Cancelled (3,247) (5,218) (9,127)
Number of Shares, Nonvested Restricted Stock at End of Year 219,084 258,779 267,090
Weighted Average Grant Date Fair Value, Nonvested Restricted Stock at Beginning of Year $ 85.34 $ 62.56 $ 75.35
Weighted Average Grant Date Fair Value, Granted 126.23 139.91 63.83
Weighted Average Grant Date Fair Value, Vested 104.33 87.47 78.89
Weighted Average Grant Date Fair Value, Cancelled 124.82 75.10 71.46
Weighted Average Grant Date Fair Value, Nonvested Restricted Stock at End of Year $ 96.54 $ 85.34 $ 62.56