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Stock-Based Compensation (Additional Information) (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 1.2 $ 5.2
Restricted Stock Awards
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unearned stock-based compensation expense of outstanding Restricted Units $ 19.7  
Weighted average remaining recognition period of outstanding Restricted Units 1 year 7 months  
Purchase price for restricted units, vested $ 0.001