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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of interest expense accrued for an underpayment of income taxes.

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 27, 2015	Mar. 28, 2014	Mar. 27, 2015	Mar. 28, 2014	Sep. 26, 2014	Aug. 14, 2014
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	212.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent	66.00%		10.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	36.00%		14.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	3.00%
Income tax benefit	$ (34.2)us-gaap_IncomeTaxExpenseBenefit	$ (20.3)us-gaap_IncomeTaxExpenseBenefit	$ (43.5)us-gaap_IncomeTaxExpenseBenefit	$ (3.7)us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations before income taxes	42.3	(8.6)	125.1	54.4
Effective tax rate	(80.90%)	236.00%	(34.80%)	(6.80%)
Increase (Decrease) in Income Taxes	13.9us-gaap_IncreaseDecreaseInIncomeTaxes
Increase (Decrease) in Effective Tax Rate	(316.00%)mnk_IncreaseDecreaseinEffectiveTaxRate		28.00%mnk_IncreaseDecreaseinEffectiveTaxRate
Discontinued Operation, Tax Effect of Discontinued Operation			22.5
Deferred Tax Assets, Valuation Allowance	8.2		8.2
Unrecognized tax benefits	77.4us-gaap_UnrecognizedTaxBenefits		77.4us-gaap_UnrecognizedTaxBenefits		82.0us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits, net increase			4.6
Unrecognized tax benefits, additions related to prior period tax positions			2.7
Unrecognized tax benefits, additions related to current year tax positions			3.4
Unrecognized tax benefits, decrease related to settlements			4.0
Unrecognized tax benefits, lapse of statute of limitations			1.3
Unrecognized tax benefits, which if favorably settled would benefit the effective tax rate	77.4		77.4
Interest accrued on unrecognized tax benefits	42.0		42.0		45.1
Unrecognized tax benefits that would impact effective tax rate, upper bound of change	15.0		15.0
Income tax penalties and interest accrued that would impact effective tax rate, upper bound of change	11.3		11.3
Increase (Decrease) in Income Taxes Payable	5.0
Tax Adjustments, Settlements, and Unusual Provisions			3.0
Questcor Pharmaceuticals, Inc.
Income Taxes [Line Items]
Increase in deferred tax liability, net due to installment sale note receivable	1,515.9		1,515.9
Increase in deferred tax charge, due to installment sale			25.3
Increase in prepaid taxes, due to installment sale			1.9
Acquired deferred tax liabilities, net	$ (1,488.7)		$ (1,488.7)			$ 1,914.5