v3.26.1
Stock-Based Awards - Summary of Stock Option Activity Including Aggregate Intrinsic Value (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Options    
Outstanding as of beginning of period | shares 5,759  
Granted | shares 1,291  
Exercised | shares (76)  
Forfeited | shares (23)  
Expired | shares (284)  
Outstanding as of end of period | shares 6,667 5,759
Options vested and expected to vest as of end of period | shares 6,667  
Options exercisable as of end of period | shares 4,437  
Weighted Average Exercise Price    
Outstanding | $ / shares $ 36.31  
Granted | $ / shares 13.72  
Exercised | $ / shares 8.94  
Forfeited | $ / shares 21.39  
Expired | $ / shares 36.24  
Outstanding | $ / shares 32.3 $ 36.31
Options vested and expected to vest as of end of period | $ / shares 32.3  
Options exercisable as of end of period | $ / shares $ 42.16  
Weighted Average Remaining Contractual Term    
Outstanding as of end of period 6 years 3 months 18 days 6 years
Options vested and expected to vest as of end period 6 years 3 months 18 days  
Options exercisable as of end of period 5 years 1 month 6 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value | $ $ 12,570 $ 6,457
Options vested and expected to vest as of end of period | $ 12,570  
Options exercisable as of end of period | $ $ 5,989