Debt (Schedule of Long term debt and Capital lease obligation) (Details) - USD ($) $ in Millions	Sep. 25, 2015	Sep. 26, 2014
Current maturities of long-term debt:
Long-term Debt, Current Maturities	$ 22.3	$ 21.2
Capital lease obligation and vendor financing agreements	1.3	1.4
Long-term debt:
Long-term Debt, Gross	6,584.2	3,959.6
Unamortized Debt Issuance Expense and Discount	109.9	85.6
Capital Lease Obligations, Noncurrent	1.0	0.4
Debt, Long-term and Short-term, Combined Amount	6,606.5	3,980.8
Variable rate receivable securitization
Long-term debt:
Long-term Debt, Gross	153.0	150.0
Unamortized Debt Issuance Expense and Discount	0.8	1.0
Senior Notes | 3.50% notes due April 2018
Long-term debt:
Long-term Debt, Gross	300.0	300.0
Unamortized Debt Issuance Expense and Discount	1.7	2.4
Senior Notes | 4.75% notes due April 2023
Long-term debt:
Long-term Debt, Gross	600.0	600.0
Unamortized Debt Issuance Expense and Discount	7.1	7.9
Senior Notes | 2020 Notes
Long-term debt:
Long-term Debt, Gross	700.0
Unamortized Debt Issuance Expense and Discount	11.3
Senior Notes | 5.75% notes due August 2022
Long-term debt:
Long-term Debt, Gross	900.0	900.0
Unamortized Debt Issuance Expense and Discount	14.4	16.4
Senior Notes | 5.625% notes due October 2023
Long-term debt:
Long-term Debt, Gross	750.0	0.0
Unamortized Debt Issuance Expense and Discount	13.7	0.0
Senior Notes | 5.50% notes due April 2025
Long-term debt:
Long-term Debt, Gross	700.0	0.0
Unamortized Debt Issuance Expense and Discount	11.9	0.0
Secured Debt | 2.85% term loan due April 2016
Current maturities of long-term debt:
Long-term Debt, Current Maturities	0.0	0.4
Long-term debt:
Long-term Debt, Gross	0.0	2.7
Unamortized Debt Issuance Expense and Discount	0.0	0.0
Secured Debt | Term loans due March 2021
Current maturities of long-term debt:
Long-term Debt, Current Maturities	20.0	18.2
Long-term debt:
Long-term Debt, Gross	1,958.5	1,978.5
Unamortized Debt Issuance Expense and Discount	44.1	52.4
Secured Debt | 4.00% term loan due February 2022
Current maturities of long-term debt:
Long-term Debt, Current Maturities	1.0	1.2
Long-term debt:
Long-term Debt, Gross	6.9	9.6
Unamortized Debt Issuance Expense and Discount	0.0	0.0
Debentures | 8.00% debentures due March 2023
Long-term debt:
Long-term Debt, Gross	4.4	8.0
Unamortized Debt Issuance Expense and Discount	0.0	0.0
Debentures | 9.50% debentures due May 2022
Long-term debt:
Long-term Debt, Gross	10.4	10.4
Unamortized Debt Issuance Expense and Discount	0.0	0.0
2015 Revolving Credit Facility
Long-term debt:
Long-term Debt, Gross	500.0	0.0
Unamortized Debt Issuance Expense and Discount	4.9	5.5
Capital Lease Obligations
Long-term debt:
Unamortized Debt Issuance Expense and Discount	$ 0.0	$ 0.0