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Employee Benefits - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended 36 Months Ended
Sep. 30, 2020
USD ($)
Stock-Plan
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Stock-Plan
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of employers contribution as percentage of employees contribution 100.00%      
Maximum percentage of employers contribution on eligible compensation 4.00%      
Discretionary and matching contributions to plan | $ $ 2,434 $ 1,979 $ 2,118  
Number of active stock-based compensation plan | Stock-Plan 2     2
Options granted, authorizing limit 2,043     2,043
Rate of exercise price of underlying common shares 100.00%      
Weighted average grant-date fair value | $ / shares $ 3.54 $ 3.61 $ 3.27  
Weighted average remaining vesting period 1 year 6 months 10 days      
Number of restricted share units vested 157,000      
Stock-based compensation | $ $ 3,802 $ 3,251 $ 3,402  
Total income tax benefit recognized in stock-based compensation arrangements | $ $ 898 572 303  
Stock compensation expense expected period for recognition 2021 through 2023      
Stock compensation expense to adjust estimated forfeiture rates to actual | $ $ 148 127 106  
Total intrinsic value of options exercised | $ 1,585 62 2  
Total grant-date fair value of options that vested | $ 528 735 580  
roceeds from exercises of stock options | $ $ 3,559 $ 443 $ 183  
Chief Executive Officer [Member] | Amended and Restated Employment Agreement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 198,000      
Restricted share units granted 100,000      
Weighted average grant-date fair value | $ / shares $ 3.38   $ 3.19  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%      
Vesting End Date Oct. 01, 2022      
Restricted Stock Units and Restricted Stock Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units granted       1,040,000
Weighted-average grant date fair value of restricted share units granted | $ / shares $ 10.13 $ 18.66 $ 14.65  
Weighted-average grant date fair value | $ / shares $ 16.73      
Restricted share units outstanding 603,000     603,000
Weighted average grant date fair value of outstanding restricted share units | $ / shares $ 13.27     $ 13.27
Intrinsic value of restricted share units | $ $ 10,237     $ 10,237
Stock-based compensation | $ 2,796 $ 2,709 $ 2,609  
Stock-based compensation | $ $ 3,122     $ 3,122
Restricted Stock Units and Restricted Stock Shares [Member] | Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units granted     13,000  
Weighted-average grant date fair value | $ / shares     $ 14.50  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     100.00%  
Restricted Stock Units and Restricted Stock Shares [Member] | Chief Executive Officer [Member] | Amended and Restated Employment Agreement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant date fair value | $ / shares $ 10.10      
Restricted Stock Units and Restricted Stock Shares [Member] | Former Chief Executive Officer [Member] | Amended and Restated Employment Agreement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units granted     25,000  
Weighted-average grant date fair value | $ / shares     $ 15.30  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     if specified revenue and earnings per share targets were achieved for fiscal 2018. As a result of the fiscal 2018 performance targets related to this grant being achieved, these restricted share units were fully vested and the related shares were paid to Mr. Kraeutler in November 2018.  
2004 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for grant 3,000,000     3,000,000
Granted, Shares 1,255,000      
Maximum terms 10 years      
2012 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for grant 3,000,000     3,000,000
Granted, Shares 2,702,000      
Maximum terms 10 years      
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation | $ $ 1,006 $ 542 $ 793  
Stock-based compensation | $ $ 515     $ 515
Stock Options [Member] | Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares     100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years