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Employee Benefits - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended 15 Months Ended 36 Months Ended
Sep. 30, 2018
USD ($)
Stock_Plan
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
Sep. 30, 2018
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 $ 2,118 $ 1,912 $ 1,631    
Number of active stock-based compensation plan | Stock_Plan 2       2
Options granted, authorizing limit | shares 2,707,000       2,707,000
Rate of exercise price of underlying common shares 100.00%        
Weighted average grant-date fair value | $ / shares $ 3.27 $ 2.65 $ 3.46    
Weighted average remaining vesting period 1 year 7 months 17 days        
Number of restricted share units vested | shares 175,000        
Stock-based compensation $ 3,402 $ 3,381 $ 2,911    
Total income tax benefit recognized in stock-based compensation arrangements $ 303 861 1,100    
Stock compensation expense expected period for recognition 2019 through 2023        
Stock compensation expense to adjust estimated forfeiture rates to actual $ 106 106 76    
Total intrinsic value of options exercised 2 9 616    
Total grant-date fair value of options that vested 580 494 474    
Cash received from options exercised 183 302 2,364    
Tax expense recorded to additional paid-in capital from option exercises $ 0 $ 431 $ 70    
Restricted Stock Units and Restricted Stock Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted share units granted | shares         1,220
Weighted-average grant date fair value of restricted share units granted | $ / shares $ 14.65 $ 16.93 $ 19.38    
Weighted-average grant date fair value | $ / shares $ 21.32        
Restricted share units outstanding | shares 555,000       555,000
Weighted average grant date fair value of outstanding restricted share units | $ / shares $ 16.69       $ 16.69
Intrinsic value of restricted share units $ 8,272       $ 8,272
Stock-based compensation 2,609 $ 2,719 $ 2,351    
Stock-based compensation $ 2,317       $ 2,317
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]          
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   $ 19.09 $ 17.03    
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        
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 have fully vested.        
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 1,338,000        
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 1,955,000        
Maximum terms 10 years        
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation $ 793 $ 662 $ 560    
Stock-based compensation $ 571       $ 571
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