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Employee Benefits - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended 15 Months Ended 36 Months Ended
Oct. 01, 2019
shares
Sep. 30, 2019
USD ($)
Stock-Plan
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
Sep. 30, 2019
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%     3.00%  
Discretionary and matching contributions to plan | $   $ 1,979 $ 2,118 $ 1,912    
Number of active stock-based compensation plan | Stock-Plan   2       2
Options granted, authorizing limit | shares   2,657       2,657
Rate of exercise price of underlying common shares   100.00%        
Weighted average grant-date fair value | $ / shares   $ 3.61 $ 3.27 $ 2.65    
Weighted average remaining vesting period   1 year 6 months 10 days        
Number of restricted share units vested | shares   285,000        
Stock-based compensation | $   $ 3,251 $ 3,402 $ 3,381    
Total income tax benefit recognized in stock-based compensation arrangements | $   $ 572 303 861    
Stock compensation expense expected period for recognition   2020 through 2023        
Stock compensation expense to adjust estimated forfeiture rates to actual | $   $ 127 106 106    
Total intrinsic value of options exercised | $   62 2 9    
Total grant-date fair value of options that vested | $   735 580 494    
Cash received from options exercised | $   443 183 302    
Tax expense recorded to additional paid-in capital from option exercises | $   $ 0 $ 0 $ 431    
Chief Executive Officer [Member] | Amended and Restated Employment Agreement [Member] | Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Shares | shares 198,000          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years          
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 | shares           1,100,000
Weighted-average grant date fair value of restricted share units granted | $ / shares   $ 18.66 $ 14.65 $ 16.93    
Weighted-average grant date fair value | $ / shares   $ 17.34        
Restricted share units outstanding | shares   432,000       432,000
Weighted average grant date fair value of outstanding restricted share units | $ / shares   $ 17.17       $ 17.17
Intrinsic value of restricted share units | $   $ 4,096       $ 4,096
Stock-based compensation | $   2,709 $ 2,609 $ 2,719    
Stock-based compensation | $   $ 2,756       $ 2,756
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 | shares     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] | Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted share units granted | shares 99,000          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%          
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 | shares     25,000 25,000    
Weighted-average grant date fair value | $ / shares     $ 15.30 $ 19.09    
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 | shares   3,000,000       3,000,000
Granted, Shares | shares   1,292,000        
Maximum terms   10 years        
2012 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized for grant | shares   3,000,000       3,000,000
Granted, Shares | shares   2,051,000        
Maximum terms   10 years        
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation | $   $ 542 $ 793 $ 662    
Stock-based compensation | $   $ 240       $ 240
Stock Options [Member] | Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Shares | shares     100,000      
Weighted average grant-date fair value | $ / shares     $ 3.19      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years