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Equity-based Compensation - Summary of Option Activity (Detail)
shares in Thousands
12 Months Ended
Sep. 30, 2023
$ / shares
shares
Share-Based Payment Arrangement [Abstract]  
Number of Share Options, Outstanding, Beginning Balance | shares 2,441
Number of Share Options, Granted | shares 0
Number of Share Options, Exercised | shares (799)
Number of Share Options, Forfeited | shares (45)
Number of Share Options, Outstanding, Ending Balance | shares 1,597
Number of Share Options, Exercisable | shares 1,373
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 62.66
Weighted Average Exercise Price, Granted | $ / shares 0
Weighted Average Exercise Price, Exercised | $ / shares 60.91
Weighted Average Exercise Price, Forfeited | $ / shares 67.05
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares 63.41
Weighted Average Exercise Price, Exercisable | $ / shares $ 62.55