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Summary of Restricted Stock Units Activity (Detail) - $ / shares
shares in Thousands
1 Months Ended 6 Months Ended
May 31, 2021
May 31, 2020
Sep. 30, 2021
Number of Shares      
Granted 25,172 30,881  
Restricted Stock Units      
Number of Shares      
Beginning Balance     301
Granted     156
Vested     (103)
Forfeited     (19)
Ending Balance     335
Weighted Average Grant Date Fair Value      
Beginning Balance     $ 273.57
Granted     288.64
Vested     304.20
Forfeited     270.35
Ending Balance     $ 271.32