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Equity-based Compensation - Summary of Restricted Stock and Restricted Stock Units Activity (Detail)
shares in Thousands
12 Months Ended
Sep. 30, 2024
$ / shares
shares
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
Number of Restricted Shares, Outstanding, Beginning Balance | shares 2,054
Number of Restricted Shares, Granted | shares 1,087
Number of Restricted Shares, Vested | shares (855)
Number of Restricted Shares, Forfeited | shares (111)
Number of Restricted Shares, Ending Balance | shares 2,175
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 77.28
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares 80.27
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares 74.43
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares 82.8
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 79.61
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
Number of Restricted Shares, Outstanding, Beginning Balance | shares 560
Number of Restricted Shares, Granted | shares 307
Number of Restricted Shares, Vested | shares (198)
Number of Restricted Shares, Forfeited | shares (50)
Number of Restricted Shares, Ending Balance | shares 619
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 79.73
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares 85.6
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares 77.65
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares 80.91
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 83.21