Condensed Consolidating and Combining Financial Statements (Schedule of Condensed Consolidating and Combining Statements of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 27, 2014	Jun. 28, 2013
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	$ 168.1	$ 6.2
Cash Flows From Investing Activities:
Capital expenditures	(80.1)	(110.5)
Acquisitions and intangibles, net of cash acquired	(1,303.2)	(88.1)
Intercompany loan investment	0	0
Repayment of intercompany loan investment	0
Investment in subsidiary	0
Restricted cash	4.1	0
Other	8.7	0.1
Net cash (used in) investing activities	(1,370.5)	(198.5)
Cash Flows From Financing Activities:
Issuance of external debt	1,296.8	898.1
Repayment of external debt	(30.1)	0
Repayment of capital leases	(1.1)	(1.0)
Debt financing costs	(32.2)	(12.0)
Excess tax benefit from share-based compensation	5.2	3.4
Proceeds from exercise of share options	19.9	0
Purchase of treasury shares	1.9	0
Net transfers from (to) parent	0	(515.9)
Other	0	0.1
Advances from intercompany borrowings	0	0
Payment on intercompany borrowings	0
Capital contribution	0
Net cash provided by financing activities	1,256.6	372.7
Effect of currency rate changes on cash	(1.8)	0
Net increase in cash and cash equivalents	52.4	180.4
Cash and cash equivalents at beginning of period	275.5	0
Cash and cash equivalents at end of period	327.9	180.4
Mallinckrodt plc
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	9.9	0
Cash Flows From Investing Activities:
Capital expenditures	0	0
Acquisitions and intangibles, net of cash acquired	0	0
Intercompany loan investment	(26.3)	0
Repayment of intercompany loan investment	0
Investment in subsidiary	0
Restricted cash	0	0
Other	0	0
Net cash (used in) investing activities	(26.3)	0
Cash Flows From Financing Activities:
Issuance of external debt	0	0
Repayment of external debt	0
Repayment of capital leases	0	0
Debt financing costs	0	0
Excess tax benefit from share-based compensation	0	0
Proceeds from exercise of share options	19.9
Purchase of treasury shares	1.9
Net transfers from (to) parent		0
Other		0
Advances from intercompany borrowings	0	0
Payment on intercompany borrowings	(2.4)
Capital contribution	0
Net cash provided by financing activities	15.6	0
Effect of currency rate changes on cash	0	0
Net increase in cash and cash equivalents	(0.8)	0
Cash and cash equivalents at beginning of period	1.2	0
Cash and cash equivalents at end of period	0.4	0
Mallinckrodt International Finance S.A.
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	(39.2)	(7.5)
Cash Flows From Investing Activities:
Capital expenditures	0	0
Acquisitions and intangibles, net of cash acquired	0	0
Intercompany loan investment	0	0
Repayment of intercompany loan investment	2.4
Investment in subsidiary	(1,300.0)
Restricted cash	0	0
Other	0	0
Net cash (used in) investing activities	(1,297.6)	0
Cash Flows From Financing Activities:
Issuance of external debt	1,296.8	898.1
Repayment of external debt	0
Repayment of capital leases	0	0
Debt financing costs	(32.2)	(12.0)
Excess tax benefit from share-based compensation	0	0
Proceeds from exercise of share options	0
Purchase of treasury shares	0
Net transfers from (to) parent		(1,200.1)
Other		0
Advances from intercompany borrowings	140.8	371.9
Payment on intercompany borrowings	0
Capital contribution	0
Net cash provided by financing activities	1,405.4	57.9
Effect of currency rate changes on cash	0	0
Net increase in cash and cash equivalents	68.6	50.4
Cash and cash equivalents at beginning of period	56.5	0
Cash and cash equivalents at end of period	125.1	50.4
Other Subsidiaries
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	197.4	13.7
Cash Flows From Investing Activities:
Capital expenditures	(80.1)	(110.5)
Acquisitions and intangibles, net of cash acquired	(1,303.2)	(88.1)
Intercompany loan investment	(114.5)	(371.9)
Repayment of intercompany loan investment	0
Investment in subsidiary	0
Restricted cash	4.1	0
Other	8.7	0.1
Net cash (used in) investing activities	(1,485.0)	(570.4)
Cash Flows From Financing Activities:
Issuance of external debt	0	0
Repayment of external debt	(30.1)
Repayment of capital leases	(1.1)	(1.0)
Debt financing costs	0	0
Excess tax benefit from share-based compensation	5.2	3.4
Proceeds from exercise of share options	0
Purchase of treasury shares	0
Net transfers from (to) parent		684.2
Other		0.1
Advances from intercompany borrowings	0	0
Payment on intercompany borrowings	0
Capital contribution	1,300.0
Net cash provided by financing activities	1,274.0	686.7
Effect of currency rate changes on cash	(1.8)	0
Net increase in cash and cash equivalents	(15.4)	130.0
Cash and cash equivalents at beginning of period	217.8	0
Cash and cash equivalents at end of period	202.4	130.0
Eliminations
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	0	0
Cash Flows From Investing Activities:
Capital expenditures	0	0
Acquisitions and intangibles, net of cash acquired	0	0
Intercompany loan investment	140.8	371.9
Repayment of intercompany loan investment	(2.4)
Investment in subsidiary	1,300.0
Restricted cash	0	0
Other	0	0
Net cash (used in) investing activities	1,438.4	371.9
Cash Flows From Financing Activities:
Issuance of external debt	0	0
Repayment of external debt	0
Repayment of capital leases	0	0
Debt financing costs	0	0
Excess tax benefit from share-based compensation	0	0
Proceeds from exercise of share options	0
Purchase of treasury shares	0
Net transfers from (to) parent		0
Other		0
Advances from intercompany borrowings	(140.8)	(371.9)
Payment on intercompany borrowings	2.4
Capital contribution	(1,300.0)
Net cash provided by financing activities	(1,438.4)	(371.9)
Effect of currency rate changes on cash	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0