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Equity Awards - Summary of Activity for Restricted Stock Units and Nonvested Restricted Stock (Detail) - Restricted Stock Units and Restricted Stock [Member]
 6 Months Ended
Sep. 30, 2025
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Restricted Stock Units and Nonvested Restricted Stock at March 31, 2025 | shares 194,099
Number of Shares, Granted | shares 70,167
Number of Shares, Vested | shares (73,347)
Number of Shares, Cancelled | shares 0
Number of Shares, Restricted Stock Units and Nonvested Restricted Stock at September 30, 2025 | shares 190,919
Weighted Average Grant Date Fair Value, Restricted Stock at March 31, 2025 | $ / shares $ 150.56
Weighted Average Grant Date Fair Value, Granted | $ / shares 215.28
Weighted Average Grant Date Fair Value, Vested | $ / shares 107.09
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 0
Weighted Average Grant Date Fair Value, Restricted Stock at September 30, 2025 | $ / shares $ 123.94