Financial Instruments and Fair Value Measurements (Schedule of Carrying Amount and Fair Value of Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 25, 2015	Sep. 25, 2015	Apr. 30, 2013
Senior Notes | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate			3.50%
Senior Notes | 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate			4.75%
Level 1 | Senior Notes | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.50%
Level 1 | Senior Notes | 4.88% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	4.875%
Level 1 | Senior Notes | 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	5.75%
Level 1 | Senior Notes | 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	4.75%
Level 1 | Senior Notes | 5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	5.50%
Level 1 | Unsecured Debt | Five Point Six Two Five Percent Note [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	5.625%
Level 2 | Debentures | 9.50% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	9.50%
Level 2 | Debentures | 8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	8.00%
Level 3 | Secured Debt | 4.00% Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	4.00%
Other Assets | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash surrender value of life insurance	$ 67.9	$ 67.7
Recurring | CNS Therapeutics, Inc. | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration, Liability	7.2
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Rate Receivable Securitization	215.0	153.0
Fair Value | Term Loan Due March 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable, Fair Value Disclosure	1,915.4	1,966.5
Fair Value | 4.00% Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable, Fair Value Disclosure	7.5	7.9
Fair Value | Senior Notes | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	285.5	294.3
Fair Value | Senior Notes | 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	845.7	876.1
Fair Value | Senior Notes | 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	553.1	539.6
Fair Value | Unsecured Debt | 4.88% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	668.2	684.1
Fair Value | Unsecured Debt | Five Point Six Two Five Percent Note [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	702.2	705.2
Fair Value | Unsecured Debt | 5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	640.9	646.0
Fair Value | Unsecured Debt | 2015 Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	400.0	500.0
Fair Value | Debentures | 9.50% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	12.0	13.0
Fair Value | Debentures | 8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	4.8	5.3
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Rate Receivable Securitization	215.0	153.0
Carrying Value | Term Loan Due March 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable, Fair Value Disclosure	1,973.5	1,978.5
Carrying Value | 4.00% Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable, Fair Value Disclosure	7.5	7.9
Carrying Value | Senior Notes | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	300.0	300.0
Carrying Value | Senior Notes | 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	884.0	900.0
Carrying Value | Senior Notes | 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	600.0	600.0
Carrying Value | Unsecured Debt | 4.88% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	700.0	700.0
Carrying Value | Unsecured Debt | Five Point Six Two Five Percent Note [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	740.0	750.0
Carrying Value | Unsecured Debt | 5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	700.0	700.0
Carrying Value | Unsecured Debt | 2015 Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	400.0	500.0
Carrying Value | Debentures | 9.50% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	10.4	10.4
Carrying Value | Debentures | 8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	$ 4.4	$ 4.4