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The Incentive Stock Plans - Incentive Stock Plans Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options granted, Options Outstanding 0   0
Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares Available for Grant, Beginning Balance 1,386,561    
Options cancelled/forfeited/expired, Shares Available for Grant 7,250    
Restricted stock awards issued, Shares Available for Grant (341,517)    
Restricted stock awards forfeited, Shares Available for Grant 16,189    
Additional shares of stock issued, Shares Available for Grant (2,689)    
Shares Available for Grant, Ending Balance 1,065,794 1,386,561  
Options Outstanding, Beginning Balance 1,207,504    
Options cancelled/forfeited/expired, Options Outstanding (7,250)    
Options exercised, Options Outstanding (181,696)    
Options Outstanding, Ending Balance 1,018,558 1,207,504  
Exercisable as of December 31, 2017, Options Outstanding 1,006,891    
Aggregate Intrinsic Value $ 7,022 $ 5,737  
Exercisable as of December 31, 2017, Aggregate Intrinsic Value $ 6,987    
Weighted Average Exercise Price, Beginning Balance $ 11.81    
Options cancelled/forfeited/expired, Weighted Average Exercise Price 15.73    
Options exercised, Weighted Average Exercise Price 10.55    
Weighted Average Exercise Price, Ending Balance 12.01 $ 11.81  
Exercisable as of December 31, 2017, Weighted Average Exercise Price $ 11.96    
Weighted Average Remaining Contractual Life 5 years 1 month 6 days 5 years 3 months 18 days  
Exercisable as of December 31, 2017, Weighted Average Remaining Contractual Life 5 years 1 month 6 days