Discontinued Operations and Divestitures (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended								12 Months Ended
		Dec. 31, 2013	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-restructuring impairment charges											$ 0	$ 151,600,000	$ 0
Provision for (benefit from) income taxes	[1]										92,900,000	10,100,000	(47,500,000)
Tax (benefit) expense on income (loss) from discontinued operations											11,500,000	(34,700,000)	21,100,000
Permanently nondeductible and nontaxable items	[2]										16,400,000	13,800,000	15,300,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount											21,500,000	32,100,000	10,000,000
Income (loss) from discontinued operations, net of income taxes			$ (14,800,000)	$ 2,400,000	$ 23,600,000	$ 5,300,000	$ (178,900,000)	$ 4,900,000	$ (8,600,000)	$ 7,100,000	16,500,000	(175,500,000)	50,600,000
Gain on Divestiture											3,500,000	15,000,000	2,900,000
International	[1]										95,100,000	17,900,000	12,100,000
International Deferred	[1]										(187,500,000)	(19,200,000)	4,400,000
Deferred Income Tax Expense (Benefit)	[1]										(188,300,000)	(68,900,000)	(13,900,000)
Domestic	[1]										300,000	40,900,000	49,300,000
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)											10,800,000	(34,700,000)	21,100,000
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
Valuation allowances, nonrecurring												2,500,000
Permanently nondeductible and nontaxable items													2,900,000
Other Tax Expense (Benefit)												2,000,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount												3,000,000	700,000
Increase (Decrease) in Accrued Liabilities												900,000
International											14,900,000	(6,600,000)	10,700,000
International Deferred											4,400,000	3,000,000	(500,000)
Deferred Income Tax Expense (Benefit)												35,600,000	5,400,000
Domestic											0	10,400,000	5,600,000
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											(100,000)	(700,000)	$ 1,000,000
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 2015, and U.S. federal and state in fiscal 2014 and fiscal 2013.

[2] Includes the impact of nondeductible transaction and separation costs.