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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Shares Available for Grant, Beginning Balance 1,787,537  
Options granted, Shares Available for Grant (571,000)  
Options cancelled/forfeited/expired, Shares Available for Grant 115,602  
Options exercised, Shares Available for Grant     
Shares Available for Grant, Ending Balance 1,332,139 1,787,537
Options Outstanding, Beginning Balance 2,301,638  
Options granted, Options Outstanding 571,000  
Options cancelled/forfeited/expired, Options Outstanding (115,602)  
Options exercised, Options Outstanding (426,076)  
Options Outstanding, Ending Balance 2,330,960 2,301,638
Exercisable at June 30, 2014 Options Outstanding 1,558,279  
Aggregate Intrinsic Value $ 15,427 $ 10,419
Exercisable at June 30, 2014, Aggregate Intrinsic Value $ 12,456  
Weighted Average Exercise Price, Beginning Balance $ 10.13  
Options granted, Weighted Average Exercise Price $ 15.81  
Options cancelled/forfeited/expired, Weighted Average Exercise Price $ 20.63  
Options exercised, Weighted Average Exercise Price $ 7.27  
Weighted Average Exercise Price, Ending Balance $ 11.52 $ 10.13
Exercisable at June 30, 2014, Weighted Average Exercise Price $ 10.86  
Weighted Average Remaining Contractual Life 6 years 9 months 18 days 6 years 6 months
Exercisable at June 30, 2014, Weighted Average Remaining Contractual Life 5 years 8 months 12 days