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Restricted Stock Awards - Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member]
3 Months Ended
Dec. 31, 2023
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares/ Units, Non-vested beginning balance 1,341,151
Shares/ Units, Awards granted 722,611
Shares/ Units, Awards vested (163,046)
Shares/ Units, Awards forfeited (19,275)
Shares/ Units, Non-vested ending balance 1,881,441
Weighted Average Grant Date Fair Value, Non-vested beginning balance | $ / shares $ 35.02
Weighted Average Grant Date Fair Value, Awards granted | $ / shares 31.11
Weighted Average Grant Date Fair Value, Awards vested | $ / shares 20.64
Weighted Average Grant Date Fair Value, Awards forfeited | $ / shares $ 31.98