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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, 2023
$ / 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 1,774
Number of Restricted Shares, Granted | shares 1,082
Number of Restricted Shares, Vested | shares (705)
Number of Restricted Shares, Forfeited | shares (97)
Number of Restricted Shares, Ending Balance | shares 2,054
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 70.83
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares 83.05
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares 69.96
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares 76.86
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 77.28
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 445
Number of Restricted Shares, Granted | shares 296
Number of Restricted Shares, Vested | shares (146)
Number of Restricted Shares, Forfeited | shares (35)
Number of Restricted Shares, Ending Balance | shares 560
Restricted Shares, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 71.5
Restricted Shares, Weighted Average Grant Date Fair Value, Granted | $ / shares 87.38
Restricted Shares, Weighted Average Grant Date Fair Value, Vested | $ / shares 71.13
Restricted Shares, Weighted Average Grant Date Fair Value, Forfeited | $ / shares 75.85
Restricted Shares, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 79.73