(Schedule of Carrying Amount and Fair Value of Long-term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 25, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable rate receivable securitization	$ 0.0	$ 153.0
Long-term Debt, Gross	5,878.5	6,584.2
Term loan due March 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan payable	1,951.8	1,966.5
Loans Payable	1,953.5	1,978.5
4.00% term loan due February 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan payable	7.1	7.9
Loans Payable	7.1	7.9
Secured Debt | Variable rate receivable securitization
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable rate receivable securitization	235.0
Secured Debt | 4.00% term loan due February 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Gross	6.0	6.9
Debentures | 9.50% debentures due May 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	12.1	13.0
Long-term Debt, Gross	10.4	10.4
Debentures | 8.00% debentures due March 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	4.9	5.3
Long-term Debt, Gross	4.4	4.4
Senior Notes | 3.50% notes due April 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	299.6	294.3
Long-term Debt, Gross	300.0	300.0
Senior Notes | 5.75% notes due August 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	869.3	876.1
Long-term Debt, Gross	884.0	900.0
Senior Notes | 4.75% notes due April 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	539.5	539.6
Long-term Debt, Gross	600.0	600.0
Debentures | Four Point Eight Eight Percent Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	712.4	684.1
Long-term Debt, Gross	700.0	700.0
Debentures | Five Point Five Percent Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	663.6	646.0
Long-term Debt, Gross	700.0	700.0
Debentures | 2015 Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	0.0	500.0
Long-term Debt, Gross	0.0	500.0
Debentures | 5.625% notes due October 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	710.2	705.2
Long-term Debt, Gross	740.0	750.0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable rate receivable securitization		153.0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable rate receivable securitization	$ 235.0	$ 153.0