v3.26.1
Equity Awards - Summary of Activity for Nonvested Restricted Shares (Detail) - Restricted Stock Units and Restricted Stock [Member] - $ / shares
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Shares, Restricted Stock Units and Nonvested Restricted Stock at Beginning of Year 194,099 204,946 222,384
Number of Shares, Granted 70,244 66,741 97,257
Number of Shares, Vested (114,937) (77,588) (111,695)
Number of Shares, Cancelled 0 0 (3,000)
Number of Shares, Restricted Stock Units and Nonvested Restricted Stock at End of Year 149,406 194,099 204,946
Weighted Average Grant Date Fair Value, Restricted Stock Units and Nonvested Restricted Stock at Beginning of Year $ 150.56 $ 121.12 $ 95.11
Weighted Average Grant Date Fair Value, Granted 215.24 240.61 169.62
Weighted Average Grant Date Fair Value, Vested 128.07 152.66 124.78
Weighted Average Grant Date Fair Value, Cancelled 0 0 30.38
Weighted Average Grant Date Fair Value, Restricted Stock Units and Nonvested Restricted Stock at End of Year $ 111.33 $ 150.56 $ 121.12