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Stock-Based Awards - Summary of PSUs and rTSRUs Activity (Detail)
shares in Thousands
 9 Months Ended
Jun. 30, 2025
$ / shares
shares
PSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, beginning balance | shares 92
Granted | shares 69
Vested | shares (68)
Cancelled | shares 0
Unvested, ending balance | shares 93
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares $ 27.98
Weighted Average Grant Date Fair Value, Granted | $ / shares 20.44
Weighted Average Grant Date Fair Value, Vested | $ / shares 47.24
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 0
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares $ 8.47
rTSRUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, beginning balance | shares 92
Granted | shares 46
Vested | shares 0
Cancelled | shares (45)
Unvested, ending balance | shares 93
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares $ 25.09
Weighted Average Grant Date Fair Value, Granted | $ / shares 8.57
Weighted Average Grant Date Fair Value, Vested | $ / shares 0
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 40.32
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares $ 9.57