Income Taxes (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Dec. 26, 2014	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Income Taxes [Line Items]
Operating loss carryforward			$ 7.0	$ 221.3
Tax credit carryforward			16.3	8.6
Tax Credit Carryforward Utilization			14.3
Income Tax Holiday, Aggregate Dollar Amount			5.1	0.3
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	[1],[2]		(138.6)	(10.6)	$ 3.3
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			21.5	$ 32.1	$ 10.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent				21.00%	23.00%
Increase (Decrease) Tax Benefit, Jurisdiction Rate Difference			128.0	$ 13.9
Increase (Decrease) Tax Expense (Benefit), Change in Operating Income			35.0	10.8
Increase (Decrease) Tax Expense (Benefit) Due to Amortization of Intangible Assets			22.5	14.0
Increase (Decrease) Foreign Tax Expense (Benefit) Due To Acquisitions			31.8
Increase (Decrease) Tax Expense (Benefit), Other			62.2	38.7
Unrecognized tax benefits that would require cash remittance if not sustained			89.2	82.0	$ 100.1
Unrecognized tax benefits, which if favorably settled would benefit the effective tax rate			87.4	82.0	96.3
Interest expense on unrecognized tax benefits			5.7	7.0	2.4
Released tax interest			9.3
Interest accrued on unrecognized tax benefits			41.7	45.1	$ 62.1
Decrease in Unrecognized Tax Benefits is Reasonably Possible			17.5
Income tax penalties and interest accrued that would impact effective tax rate, upper bound of change			8.8
Tax payments associated with non-current deferred intercompany transactions			52.2	14.8
Tax payments associate with current deferred intercompany transactions			8.7	0.6
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority			81.3
Deferred income taxes			142.7	152.3
Deferred income taxes (non-current liability)			3,132.4	2,399.6
Increase (decrease), deferred tax liability			44.0
Increase (Decrease), Deferred Tax Liability Due to Amortization of Intangible Assets			54.3
Deferred tax assets, tax credit carryforwards			163.3	93.8
Deferred tax assets, valuation allowance			233.0	76.9
Increase (decrease) deferred tax liability due to installment sale			1,465.3	93.6
Deferred tax liabilities, intangible assets			1,550.7	2,177.9
Deferred Tax Liabilities, Property, Plant and Equipment			140.1	121.6
Deferred Tax Asset, Financing Payment			20.2	32.0
Tax credit carryforwards, not subject to expiration			3.1
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries			369.0
Deferred Tax Liabilities, Undistributed Foreign Earnings			0.7
Undistributed Earnings			13.4
Ikaria
Income Taxes [Line Items]
Operating loss carryforward			4.8
Tax credit carryforward			7.2
Deferred Tax Liabilities, Net			623.6
Increase (decrease), deferred tax liability			596.9
Deferred tax liabilities, intangible assets			620.2
Deferred Tax Liabilities, Property, Plant and Equipment			17.5
Deferred Tax Assets, Tax Credit Carryforwards, Foreign			21.7
Deferred Tax Asset, Financing Payment			13.1
Deferred Tax Assets, Operating Loss Carryforwards, Foreign			4.9
Therakos
Income Taxes [Line Items]
Increase (decrease), deferred tax liability			324.3
Deferred tax liabilities, intangible assets			334.1
Deferred Tax Assets, Operating Loss Carryforwards, Foreign			13.5
Increase (Decrease), Deferred Tax Liability, Net			324.3
Cadence Pharmaceuticals, Inc.
Income Taxes [Line Items]
Operating loss carryforward				187.8
Increase (decrease) deferred tax asset resulting from installment sale transaction			105.4
Questcor Pharmaceuticals, Inc.
Income Taxes [Line Items]
Increase (Decrease) In Prepaid Taxes, Installment Sale		$ 1.9
Income Taxes Receivable				60.0
Increase (decrease) deferred tax liability due to installment sale		1,515.9
Increase (Decrease) Deferred Tax Charge, Installment Sale		25.3
Increase (Decrease) in Deferred Tax Liability, Intangible Assets		$ 1,488.7
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Advance payment in connection with proposed settlements of certain tax matters			8.9
Advance payment in connection with proposed settlement of certain tax matters, tax payment			7.4
Advance payment in connection with proposed settlement of certain tax matters, interest payment			$ 1.5
Internal Revenue Service (IRS) | Covidien
Income Taxes [Line Items]
Advance payment in connection with proposed settlements of certain tax matters				35.9
Advance payment in connection with proposed settlement of certain tax matters, tax payment				27.3
Advance payment in connection with proposed settlement of certain tax matters, interest payment				$ 8.6
U.S. - Federal and State
Income Taxes [Line Items]
Tax years that remain subject to examination			1996
Operating loss carryforwards, subject to expiration			$ 19.6
IRELAND
Income Taxes [Line Items]
Tax years that remain subject to examination			2009
Foreign Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards			$ 126.0
Operating loss carryforwards, not subject to expiration			91.4
Operating loss carryforwards, subject to expiration			34.6
Discontinued Operations, Held-for-sale
Income Taxes [Line Items]
Deferred Tax Liabilities, Undistributed Foreign Earnings			6.5
Undistributed Earnings			$ 41.3

[1] Fiscal year 2013 includes impact of items relating to entities retained by Covidien in connection with the Separation.

[2] Includes the impact of certain recurring valuation allowances for Domestic and International jurisdictions.