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Stock-Based Awards - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]
shares in Thousands
 9 Months Ended
Jun. 30, 2025
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, beginning balance | shares 428
Granted | shares 176
Vested | shares (146)
Cancelled | shares (44)
Unvested, ending balance | shares 414
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares $ 36.37
Weighted Average Grant Date Fair Value, Granted | $ / shares 8.67
Weighted Average Grant Date Fair Value, Vested | $ / shares 41.35
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 16.71
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares $ 24.92