Condensed Consolidating and Combining Financial Statements (Schedule of Condensed Consolidating and Combining Statements of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	$ 141.2	$ (7.8)
Cash Flows From Investing Activities:
Capital expenditures	(50.7)	(76.7)
Acquisitions and intangibles, net of cash acquired	(1,293.2)	(88.1)
Intercompany loan investment	0
Repayment of intercompany loan investment	0
Investment in subsidiary	0
Restricted cash	4.1	0.9
Other	8.0	(1.1)
Net cash (used in) investing activities	(1,331.8)	(165.0)
Cash Flows From Financing Activities:
Issuance of external debt	1,296.8	0
Repayment of external debt	(30.1)	0
Repayment of capital leases	(0.7)	(0.7)
Debt financing costs	(32.2)	(2.3)
Excess tax benefit from share-based compensation	4.0	3.0
Proceeds from exercise of share options	16.1	0
Purchase of treasury shares	1.8	0
Net transfers from (to) parent	0	172.8
Advances from intercompany borrowings	0
Payment on intercompany borrowings	0
Capital contribution	0
Net cash provided by (used in) financing activities	1,252.1	172.8
Effect of currency rate changes on cash	(2.1)	0
Net increase in cash and cash equivalents	59.4	0
Cash and cash equivalents at beginning of period	275.5	0
Cash and cash equivalents at end of period	334.9	0
Mallinckrodt plc
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	8.6	0
Cash Flows From Investing Activities:
Capital expenditures	0	0
Acquisitions and intangibles, net of cash acquired	0	0
Intercompany loan investment	(21.5)
Repayment of intercompany loan investment	0
Investment in subsidiary	0
Restricted cash	0	0
Other	0	0
Net cash (used in) investing activities	(21.5)	0
Cash Flows From Financing Activities:
Issuance of external debt	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	16.1
Purchase of treasury shares	1.8
Net transfers from (to) parent		0
Advances from intercompany borrowings	0
Payment on intercompany borrowings	(2.4)
Capital contribution	0
Net cash provided by (used in) financing activities	11.9	0
Effect of currency rate changes on cash	0	0
Net increase in cash and cash equivalents	(1.0)	0
Cash and cash equivalents at beginning of period	1.2	0
Cash and cash equivalents at end of period	0.2	0
Mallinckrodt International Finance S.A.
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	(17.1)	(4.8)
Cash Flows From Investing Activities:
Capital expenditures	0	0
Acquisitions and intangibles, net of cash acquired	0	0
Intercompany loan investment	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
Repayment of external debt	0
Repayment of capital leases	0	0
Debt financing costs	(32.2)	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		4.8
Advances from intercompany borrowings	80.3
Payment on intercompany borrowings	0
Capital contribution	0
Net cash provided by (used in) financing activities	1,344.9	4.8
Effect of currency rate changes on cash	0	0
Net increase in cash and cash equivalents	30.2	0
Cash and cash equivalents at beginning of period	56.5	0
Cash and cash equivalents at end of period	86.7	0
Other Subsidiaries
Cash Flows From Operating Activities:
Net cash (used in) provided by operating activities	149.7	(3.0)
Cash Flows From Investing Activities:
Capital expenditures	(50.7)	(76.7)
Acquisitions and intangibles, net of cash acquired	(1,293.2)	(88.1)
Intercompany loan investment	(58.8)
Repayment of intercompany loan investment	0
Investment in subsidiary	0
Restricted cash	4.1	0.9
Other	8.0	(1.1)
Net cash (used in) investing activities	(1,390.6)	(165.0)
Cash Flows From Financing Activities:
Issuance of external debt	0
Repayment of external debt	(30.1)
Repayment of capital leases	(0.7)	(0.7)
Debt financing costs	0	(2.3)
Excess tax benefit from share-based compensation	4.0	3.0
Proceeds from exercise of share options	0
Purchase of treasury shares	0
Net transfers from (to) parent		168.0
Advances from intercompany borrowings	0
Payment on intercompany borrowings	0
Capital contribution	1,300.0
Net cash provided by (used in) financing activities	1,273.2	168.0
Effect of currency rate changes on cash	(2.1)	0
Net increase in cash and cash equivalents	30.2	0
Cash and cash equivalents at beginning of period	217.8	0
Cash and cash equivalents at end of period	248.0	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	80.3
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	1,377.9	0
Cash Flows From Financing Activities:
Issuance of external debt	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
Advances from intercompany borrowings	(80.3)
Payment on intercompany borrowings	2.4
Capital contribution	(1,300.0)
Net cash provided by (used in) financing activities	(1,377.9)	0
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