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Restricted Stock Awards - Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member]
6 Months Ended
Mar. 31, 2025
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares/ Units, Non-vested beginning balance 1,453,229
Shares/ Units, Awards granted 560,046
Shares/ Units, Awards vested (128,509)
Shares/ Units, Awards forfeited (20,143)
Shares/ Units, Non-vested ending balance 1,864,623
Weighted Average Grant Date Fair Value, Non-vested beginning balance | $ / shares $ 32.04
Weighted Average Grant Date Fair Value, Awards granted | $ / shares 30.24
Weighted Average Grant Date Fair Value, Awards vested | $ / shares 32.3
Weighted Average Grant Date Fair Value, Awards forfeited | $ / shares $ 36.9