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Stock-Based Awards - Summary of Stock Option Activity Including Performance Based Options (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Options    
Outstanding as of beginning of period 5,184  
Granted 1,182  
Exercised (11)  
Forfeited (88)  
Expired (314)  
Outstanding as of end of period 5,953 5,184
Options vested and expected to vest as of end of period 5,953  
Options exercisable as of end of period 3,873  
Weighted Average Exercise Price    
Outstanding $ 42.67  
Granted 8.62  
Exercised 8.99  
Forfeited 20.37  
Expired 47.98  
Outstanding 36.02 $ 42.67
Options vested and expected to vest as of end of period 36.02  
Options exercisable as of end of period $ 46.84  
Weighted Average Remaining Contractual Term    
Outstanding as of end of period 6 years 4 months 24 days 6 years 3 months 18 days
Options vested and expected to vest as of end period 6 years 4 months 24 days  
Options exercisable as of end of period 5 years 2 months 12 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value $ 92 $ 1,416
Options vested and expected to vest as of end period 92  
Options exercisable as of end of period $ 17