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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 1,050,523  
Options cancelled/forfeited/expired, Shares Available for Grant 101,862  
Restricted stock awards issued, Shares Available for Grant (281,260)  
Restricted stock awards forfeited, Shares Available for Grant 1,500  
Shares Available for Grant, Ending Balance 872,625 1,050,523
Options Outstanding, Beginning Balance 1,937,874  
Options cancelled/forfeited/expired, Options Outstanding (101,862)  
Options exercised, Options Outstanding (47,790)  
Options Outstanding, Ending Balance 1,788,222 1,937,874
Exercisable as of March 31, 2016, Options Outstanding 1,067,221  
Aggregate Intrinsic Value $ 13,592 $ 6,285
Exercisable at March 31, 2016, Aggregate Intrinsic Value $ 10,952  
Weighted Average Exercise Price, Beginning Balance $ 12.95  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 23.67  
Options exercised, Weighted Average Exercise Price 5.35  
Weighted Average Exercise Price, Ending Balance 12.54 $ 12.95
Exercisable at March 31, 2016, Weighted Average Exercise Price $ 10.33  
Weighted Average Remaining Contractual Life 6 years 2 months 12 days 6 years 6 months
Exercisable as of March 31, 2016, Weighted Average Remaining Contractual Life 5 years