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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares Available for Grant, Beginning Balance 1,787,537  
Options authorized, Shares Available for Grant 0  
Options granted, Shares Available for Grant (571,000)  
Options cancelled/forfeited/expired, Shares Available for Grant 134,172  
Restricted stock awards forfeited, Shares Available for Grant 0  
Options exercised, Shares Available for Grant 0  
Shares Available for Grant, Ending Balance 1,350,709 1,787,537
Options Outstanding, Beginning Balance 2,301,638  
Options granted, Options Outstanding 571,000  
Options cancelled/forfeited/expired, Options Outstanding (134,172)  
Options exercised, Options Outstanding (512,147)  
Options Outstanding, Ending Balance 2,226,319 2,301,638
Exercisable as of September 30, 2014, Options Outstanding 1,529,976  
Aggregate Intrinsic Value $ 15,980  
Exercisable at September 30, 2014, Aggregate Intrinsic Value $ 13,144  
Weighted Average Exercise Price, Beginning Balance $ 10.13  
Options granted, Weighted Average Exercise Price $ 15.81  
Options cancelled/forfeited/expired, Weighted Average Exercise Price $ 20.15  
Options exercised, Weighted Average Exercise Price $ 7.01  
Weighted Average Exercise Price, Ending Balance $ 11.70 $ 10.13
Exercisable at September 30, 2014, Weighted Average Exercise Price $ 10.92  
Weighted Average Remaining Contractual Life 6 years 7 months 6 days 6 years 6 months
Exercisable as of September 30, 2014, Weighted Average Remaining Contractual Life 5 years 7 months 6 days