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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 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 (568,500)  
Options cancelled/forfeited/expired, Shares Available for Grant 91,447  
Options exercised, Shares Available for Grant     
Shares Available for Grant, Ending Balance 1,310,484 1,787,537
Options Outstanding, Beginning Balance 2,301,638  
Options granted, Options Outstanding 568,500  
Options cancelled/forfeited/expired, Options Outstanding (91,447)  
Options exercised, Options Outstanding (381,258)  
Options Outstanding, Ending Balance 2,397,433 2,301,638
Exercisable at March 31, 2014 Options Outstanding 1,548,313  
Aggregate Intrinsic Value, Beginning Balance $ 10,419  
Aggregate Intrinsic Value, Ending Balance 12,399 10,419
Exercisable at March 31, 2014, Aggregate Intrinsic Value $ 9,845  
Weighted Average Exercise Price, Beginning Balance $ 10.13  
Options granted, Weighted Average Exercise Price $ 15.81  
Options cancelled/forfeited/expired, Weighted Average Exercise Price $ 20.20  
Options exercised, Weighted Average Exercise Price $ 7.26  
Weighted Average Exercise Price, Ending Balance $ 11.54 $ 10.13
Exercisable at March 31, 2014, Weighted Average Exercise Price $ 11.09  
Weighted Average Remaining Contractual Life 7 years 6 years 6 months
Exercisable at December 31, 2013, Weighted Average Remaining Contractual Life 5 years 9 months 18 days