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Summary of Restricted Stock Units Activity (Detail) - $ / shares
shares in Thousands
1 Months Ended 3 Months Ended
May 31, 2021
May 31, 2020
Jun. 30, 2021
Number of Shares      
Granted 25,172 30,881  
Restricted Stock Units      
Number of Shares      
Beginning Balance     301
Granted     146
Vested     (84)
Forfeited     (7)
Ending Balance     356
Weighted Average Grant Date Fair Value      
Beginning Balance     $ 273.57
Granted     286.57
Vested     303.33
Forfeited     268.73
Ending Balance     $ 272.06