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The Incentive Stock Plans - Incentive Stock Plans Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2017
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 9,750  
Restricted stock awards issued, Shares Available for Grant (341,517)  
Restricted stock awards forfeited, Shares Available for Grant 22,689  
Additional shares of stock issued, Shares Available for Grant (5,041)  
Shares Available for Grant, Ending Balance 1,072,442 1,386,561
Options Outstanding, Beginning Balance 1,207,504  
Options cancelled/forfeited/expired, Options Outstanding (9,750)  
Options exercised, Options Outstanding (337,590)  
Options Outstanding, Ending Balance 860,164 1,207,504
Exercisable as of March 31, 2018, Options Outstanding 858,497  
Aggregate Intrinsic Value $ 6,129 $ 5,737
Exercisable as of March 31, 2018, Aggregate Intrinsic Value $ 6,125  
Weighted Average Exercise Price, Beginning Balance $ 11.81  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 14.89  
Options exercised, Weighted Average Exercise Price 10.40  
Weighted Average Exercise Price, Ending Balance 12.51 $ 11.81
Exercisable as of March 31, 2018, Weighted Average Exercise Price $ 12.50  
Weighted Average Remaining Contractual Life 5 years 5 years 3 months 18 days
Exercisable as of March 31, 2018, Weighted Average Remaining Contractual Life 5 years