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Summary of Restricted Stock Units Activity (Detail) - $ / shares
shares in Thousands
1 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
Dec. 31, 2021
Number of Shares      
Granted (1) 25,172 30,881  
Restricted Stock Units      
Number of Shares      
Beginning Balance     301
Granted (1) [1]     171
Vested     (132)
Forfeited     (30)
Ending Balance     310
Weighted Average Grant Date Fair Value      
Beginning Balance     $ 273.57
Granted (1) [1]     289.73
Vested     297.00
Forfeited     275.27
Ending Balance     $ 274.15
[1] Includes 10 thousand performance-based awards granted due to greater than 100% target vesting