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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 1,350,709  
Options granted, Shares Available for Grant (295,000)  
Options cancelled/forfeited/expired, Shares Available for Grant 105,814  
Restricted stock awards issued, Shares Available for Grant (111,000)  
Shares Available for Grant, Ending Balance 1,050,523 1,350,709
Options Outstanding, Beginning Balance 2,226,319  
Options granted, Options Outstanding 295,000  
Options cancelled/forfeited/expired, Options Outstanding (105,814)  
Options exercised, Options Outstanding (477,631)  
Options Outstanding, Ending Balance 1,937,874 2,226,319
Exercisable as of September 30, 2015, Options Outstanding 1,148,999  
Aggregate Intrinsic Value, Beginning Balance $ 15,980  
Aggregate Intrinsic Value, Ending Balance 6,285 $ 15,980
Exercisable at September 30, 2015, Aggregate Intrinsic Value $ 6,121  
Weighted Average Exercise Price, Beginning Balance $ 11.70  
Options granted, Weighted Average Exercise Price 15.90  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 24.45  
Options exercised, Weighted Average Exercise Price 6.37  
Weighted Average Exercise Price, Ending Balance 12.95 $ 11.70
Exercisable at September 30, 2015, Weighted Average Exercise Price $ 11.16  
Weighted Average Remaining Contractual Life 6 years 6 months 6 years 7 months 6 days
Exercisable as of September 30, 2015, Weighted Average Remaining Contractual Life 5 years 1 month 6 days