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Summary of Nonvested Restricted Stock Awards (Details)
12 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Price, Forfeited $ 47.74
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) | shares 2,916,471
Restricted (Nonvested) Stock  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Price, Nonvested, Outstanding beginning balance $ 45.75
Weighted Average Price, Granted 45.49
Weighted Average Price, Vested 34.45
Weighted Average Price, Forfeited 45.83
Weighted Average Price, Nonvested 45.75
Weighted Average Price, Nonvested, Outstanding ending balance $ 47.27
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Shares/Units Subject to Restriction, Nonvested, Outstanding beginning balance | shares 2,370,155
Shares/Units Subject to Restriction, Granted | shares 4,052,020
Shares/Units Subject to Restriction, Vested | shares (527,017)
Shares/Units Subject to Restriction, Forfeited | shares (353,621)
Shares/Units Subject to Restriction, Outstanding ending balance | shares 9,566,044
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted from Performance Shares in Period, Weighted Average Grant Date Fair Value $ 49.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted from Performance Shares in Period | shares 1,108,036