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Restricted Stock Awards - Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member]
 12 Months Ended
Sep. 30, 2025
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares/ Units, Non-vested beginning balance | shares 1,453,229
Shares/ Units, Awards granted | shares 574,132
Shares/ Units, Awards vested | shares (668,780)
Shares/ Units, Awards forfeited | shares (169,428)
Shares/ Units, Non-vested ending balance | shares 1,189,153
Weighted Average Grant Date Fair Value, Non-vested beginning balance | $ / shares $ 32.04
Weighted Average Grant Date Fair Value, Awards granted | $ / shares 30.12
Weighted Average Grant Date Fair Value, Awards vested | $ / shares 31.06
Weighted Average Grant Date Fair Value, Awards forfeited | $ / shares 33.52
Weighted Average Grant Date Fair Value, Non-vested ending balance | $ / shares $ 31.45