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Summary of Restricted Stock Units Activity (Detail) - $ / shares
1 Months Ended 6 Months Ended
May 31, 2021
May 31, 2020
Sep. 30, 2022
Number of Shares      
Granted (1) 25,172 15,425  
Restricted Stock Units      
Number of Shares      
Beginning Balance     307
Granted (1) [1]     267
Vested     (122)
Forfeited     (7)
Ending Balance     445,000
Weighted Average Grant Date Fair Value      
Beginning Balance     $ 274.32
Granted (1) [1]     266.68
Vested     284.98
Forfeited     275.21
Ending Balance     $ 266.72
[1] Includes 19,000 performance-based awards granted due to greater than 100% target vesting.