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Restricted Stock Awards - Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member]
 12 Months Ended
Sep. 30, 2023
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares/ Units, Non-vested beginning balance | shares 934,517
Shares/ Units, Awards granted | shares 825,573
Shares/ Units, Awards vested | shares (398,494)
Shares/ Units, Awards forfeited | shares (20,445)
Shares/ Units, Non-vested ending balance | shares 1,341,151
Weighted Average Grant Date Fair Value, Non-vested beginning balance | $ / shares $ 35.23
Weighted Average Grant Date Fair Value, Awards granted | $ / shares 32.16
Weighted Average Grant Date Fair Value, Awards vested | $ / shares 29.75
Weighted Average Grant Date Fair Value, Awards forfeited | $ / shares 31.98
Weighted Average Grant Date Fair Value, Non-vested ending balance | $ / shares $ 35.02