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The Incentive Stock Plans - Incentive Stock Plans Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 732,103  
Options cancelled/forfeited/expired, Shares Available for Grant 36,167  
Restricted stock awards issued, Shares Available for Grant (355,342)  
Restricted stock awards forfeited, Shares Available for Grant 1,000  
Additional shares of stock issued, Shares Available for Grant (36,705)  
Shares Available for Grant, Ending Balance 377,223 732,103
Options Outstanding, Beginning Balance 1,451,102  
Options cancelled/forfeited/expired, Options Outstanding (36,167)  
Options exercised, Options Outstanding (33,404)  
Options Outstanding, Ending Balance 1,381,531 1,451,102
Exercisable as of December 31, 2016, Options Outstanding 1,135,530  
Aggregate Intrinsic Value $ 10,185 $ 12,397
Exercisable as of December 31, 2016, Aggregate Intrinsic Value $ 9,324  
Weighted Average Exercise Price, Beginning Balance $ 12.33  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 26.37  
Options exercised, Weighted Average Exercise Price 10.46  
Weighted Average Exercise Price, Ending Balance 12.00 $ 12.33
Exercisable as of December 31, 2016, Weighted Average Exercise Price $ 11.17  
Weighted Average Remaining Contractual Life 6 years 6 years
Exercisable as of December 31, 2016, Weighted Average Remaining Contractual Life 5 years 7 months 6 days