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Stock-Based Compensation (Summary of Weighted-Average Grant-Date Fair Value and Intrinsic Value of Restricted Units Vested) (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Document Period End Date Dec. 31, 2016  
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average grant-date fair value per share $ 15.90 $ 20.40
Total intrinsic value of shares vested (in millions) $ 88.3 $ 115.6
Restricted Stock Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total intrinsic value of shares vested (in millions)   $ 4.3