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Summary of Restricted Stock Units Activity (Detail) - $ / shares
1 Months Ended 3 Months Ended
May 31, 2021
May 31, 2020
Jun. 30, 2022
Number of Shares      
Granted (1) 25,172 15,425  
Restricted Stock Units      
Number of Shares      
Beginning Balance     307
Granted (1) [1]     258
Vested     (106)
Forfeited     (3)
Ending Balance     456,000
Weighted Average Grant Date Fair Value      
Beginning Balance     $ 274.32
Granted (1) [1]     266.07
Vested     282.80
Forfeited     272.26
Ending Balance     $ 267.00
[1] Includes 19,000 performance-based awards granted due to greater than 100% target vesting.