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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, 2013
Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Shares Available for Grant, Beginning Balance 1,062,448  
Options authorized, Shares Available for Grant 1,000,000 500,000
Options granted, Shares Available for Grant (572,250)  
Options cancelled/forfeited/expired, Shares Available for Grant 273,897  
Restricted stock awards forfeited, Shares Available for Grant 23,442  
Options exercised, Shares Available for Grant     
Shares Available for Grant, Ending Balance 1,787,537 1,062,448
Options Outstanding, Beginning Balance 2,507,685  
Options granted, Options Outstanding 572,250  
Options cancelled/forfeited/expired, Options Outstanding (273,897)  
Options exercised, Options Outstanding (504,400)  
Options Outstanding, Ending Balance 2,301,638 2,507,685
Exercisable at September 30, 2013 Options Outstanding 1,795,321  
Aggregate Intrinsic Value, Beginning Balance $ 4,588  
Aggregate Intrinsic Value, Ending Balance 10,419 4,588
Exercisable at September 30, 2013, Aggregate Intrinsic Value $ 7,934  
Weighted Average Exercise Price, Beginning Balance $ 9.86  
Options granted, Weighted Average Exercise Price $ 7.62  
Options cancelled/forfeited/expired, Weighted Average Exercise Price $ 11.23  
Options exercised, Weighted Average Exercise Price $ 5.34  
Weighted Average Exercise Price, Ending Balance $ 10.13 $ 9.86
Exercisable at September 30, 2013 , Weighted Average Exercise Price $ 10.93  
Weighted Average Remaining Contractual Life 6 years 6 months 6 years 6 months
Exercisable at September 30, 2013, Weighted Average Remaining Contractual Life 5 years 10 months 24 days