Discontinued Operations and Divestitures (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended								12 Months Ended
		Dec. 31, 2013	Sep. 30, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 25, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-restructuring impairment charges											$ 16,900,000	$ 0	$ 27,100,000
Provision for (benefit from) income taxes	[1]										255,600,000	129,300,000	12,600,000
Tax (benefit) expense on income (loss) from discontinued operations											43,500,000	47,900,000	(32,200,000)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount													19,000,000.00
Income (loss) from discontinued operations, net of income taxes			$ 5,000,000	$ 22,600,000	$ 19,800,000	$ 107,300,000	$ 2,100,000	$ 23,400,000	$ 43,500,000	$ 19,100,000	154,700,000	88,100,000	(297,300,000)
Gain on Divestiture											0	3,000,000	15,000,000
International	[1]										120,500,000	67,300,000	18,900,000
Deferred Foreign Income Tax Expense (Benefit)	[1]										(377,100,000)	(196,000,000)	(11,900,000)
Deferred Income Tax Expense (Benefit)	[1]										376,400,000	196,800,000	53,800,000
Domestic	[1]										300,000	200,000	22,300,000
Contrast Media and Delivery Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration							270,000,000					270,000,000
Non-restructuring impairment charges													204,000,000
Goodwill, Impairment Loss													100,200,000
Income tax expense (benefit)											(2,500,000)	10,800,000	(34,700,000)
Taxes paid or to be paid in connection with disposition							$ 10,000,000					10,000,000
Provision for (benefit from) income taxes													(36,200,000)
Tax (benefit) expense on income (loss) from discontinued operations											(2,100,000)
Valuation allowances, nonrecurring													2,500,000
Other Tax Expense (Benefit)													2,000,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount													3,000,000
Increase (Decrease) in Accrued Liabilities													900,000
International											900,000	14,900,000	(6,600,000)
Deferred Foreign Income Tax Expense (Benefit)											(3,400,000)	(4,400,000)	(3,000,000)
Deferred Income Tax Expense (Benefit)													(35,600,000)
Domestic												0	10,400,000
Mallinckrodt Baker
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes											$ 3,000,000	(100,000)	(700,000)
Tastemaker
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for Loss (Gain) on Disposal, Net of Tax												$ (22,500,000)
Property, Plant and Equipment | Contrast Media and Delivery Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of													51,400,000
Finite-Lived Intangible Assets | Contrast Media and Delivery Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of													52,400,000
Oxymorphone ER
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Productive Assets		$ 4,000,000
Contractually Obligated Future Proceeds from Sale Of Productive Assets		$ 8,000,000
Gain on Divestiture													$ 11,700,000

[1] Domestic reflects U.K. in fiscal 2016 and 2015, and U.S. federal and state in fiscal 2014.