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Stock-Based Awards - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Aggregate of unrecognized stock-based compensation cost $ 55,346    
Weighted average recognition period 2 years 4 months 24 days    
PSUs and rTSRUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value, vested during period $ 1,414 $ 0 $ 1,227
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value, vested during period $ 2,427 $ 1,897 $ 3,149
Restricted Stock Units [Member] | Service Based [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Executive Officers [Member] | Relative Total Stockholder Return Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares range percentage 0.00%    
Number of shares range percentage 150.00%    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of common stock reserved for issuance 186    
Shares issued 0    
2019 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grant 1,363    
Options granted, expiration period 10 years    
2019 Equity Incentive Plan [Member] | Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
2019 Equity Incentive Plan [Member] | Non-Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year