Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 26, 2015	Sep. 26, 2014	Jun. 27, 2014	Sep. 27, 2013
Current Assets:
Cash and cash equivalents	$ 225.3	$ 707.8	$ 327.9	$ 275.5
Accounts receivable, net	624.6	545.6
Inventories	377.8	396.6
Deferred income taxes	143.5	165.2
Prepaid expenses and other current assets	170.0	255.8
Intercompany receivables	0.0	0.0
Total current assets	1,541.2	2,071.0
Property, plant and equipment, net	1,015.5	949.2
Goodwill	3,234.0	2,401.9
Intangible assets, net	8,680.5	7,112.2
Investment in subsidiaries	0.0	0.0
Intercompany loans receivable	0.0	0.0
Other assets	408.0	330.5
Total Assets	14,879.2	12,864.8
Current Liabilities:
Current maturities of long-term debt	22.6	21.2
Accounts payable	142.5	128.7
Accrued payroll and payroll-related costs	91.5	125.1
Accrued royalties	26.1	68.0
Accrued and other current liabilities	476.8	561.8
Intercompany payables	0.0	0.0
Total current liabilities	759.5	904.8
Long-term debt	5,333.1	3,951.5
Pension and postretirement benefits	112.2	119.1
Environmental liabilities	74.0	59.9
Deferred income taxes	2,923.6	2,398.6
Other income tax liabilities	123.5	122.6
Intercompany loans payable	0.0	0.0
Other liabilities	255.2	350.3
Total Liabilities	9,581.1	7,906.8
Shareholders' Equity	5,298.1	4,958.0
Total Liabilities and Shareholders' Equity	14,879.2	12,864.8
Mallinckrodt plc
Current Assets:
Cash and cash equivalents	0.2	0.3	0.4	1.2
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Deferred income taxes	0.0	0.0
Prepaid expenses and other current assets	0.5	0.5
Intercompany receivables	7.0	13.5
Total current assets	7.7	14.3
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	14,665.9	586.8
Intercompany loans receivable	203.6	4,385.0
Other assets	0.0	0.0
Total Assets	14,877.2	4,986.1
Current Liabilities:
Current maturities of long-term debt	0.0	0.0
Accounts payable	4.0	1.2
Accrued payroll and payroll-related costs	0.1	0.1
Accrued royalties	0.0	0.0
Accrued and other current liabilities	2.9	1.1
Intercompany payables	9,572.1	25.7
Total current liabilities	9,579.1	28.1
Long-term debt	0.0	0.0
Pension and postretirement benefits	0.0	0.0
Environmental liabilities	0.0	0.0
Deferred income taxes	0.0	0.0
Other income tax liabilities	0.0	0.0
Intercompany loans payable	0.0	0.0
Other liabilities	0.0	0.0
Total Liabilities	9,579.1	28.1
Shareholders' Equity	5,298.1	4,958.0
Total Liabilities and Shareholders' Equity	14,877.2	4,986.1
Mallinckrodt International Finance S.A.
Current Assets:
Cash and cash equivalents	49.9	18.5	125.1	56.5
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Deferred income taxes	0.0	0.0
Prepaid expenses and other current assets	0.3	10.8
Intercompany receivables	0.0	0.0
Total current assets	50.2	29.3
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	12,572.5	10,645.7
Intercompany loans receivable	9.6	0.0
Other assets	91.7	76.5
Total Assets	12,724.0	10,751.5
Current Liabilities:
Current maturities of long-term debt	19.9	18.2
Accounts payable	0.1	0.2
Accrued payroll and payroll-related costs	0.0	0.0
Accrued royalties	0.0	0.0
Accrued and other current liabilities	61.5	50.9
Intercompany payables	0.2	0.0
Total current liabilities	81.7	69.3
Long-term debt	5,156.3	3,770.4
Pension and postretirement benefits	0.0	0.0
Environmental liabilities	0.0	0.0
Deferred income taxes	0.0	0.0
Other income tax liabilities	0.0	0.0
Intercompany loans payable	2,387.3	1,966.6
Other liabilities	0.0	0.0
Total Liabilities	7,625.3	5,806.3
Shareholders' Equity	5,098.7	4,945.2
Total Liabilities and Shareholders' Equity	12,724.0	10,751.5
Other Subsidiaries
Current Assets:
Cash and cash equivalents	175.2	689.0	202.4	217.8
Accounts receivable, net	624.6	545.6
Inventories	377.8	396.6
Deferred income taxes	143.5	165.2
Prepaid expenses and other current assets	169.2	244.5
Intercompany receivables	9,572.7	25.7
Total current assets	11,063.0	2,066.6
Property, plant and equipment, net	1,015.5	949.2
Goodwill	3,234.0	2,401.9
Intangible assets, net	8,680.5	7,112.2
Investment in subsidiaries	5,098.7	4,945.1
Intercompany loans receivable	2,389.2	1,941.6
Other assets	316.3	254.0
Total Assets	31,797.2	19,670.6
Current Liabilities:
Current maturities of long-term debt	2.7	3.0
Accounts payable	138.4	127.3
Accrued payroll and payroll-related costs	91.4	125.0
Accrued royalties	26.1	68.0
Accrued and other current liabilities	412.4	509.8
Intercompany payables	7.4	13.5
Total current liabilities	678.4	846.6
Long-term debt	176.8	181.1
Pension and postretirement benefits	112.2	119.1
Environmental liabilities	74.0	59.9
Deferred income taxes	2,923.6	2,398.6
Other income tax liabilities	123.5	122.6
Intercompany loans payable	215.1	4,360.0
Other liabilities	255.2	350.3
Total Liabilities	4,558.8	8,438.2
Shareholders' Equity	27,238.4	11,232.4
Total Liabilities and Shareholders' Equity	31,797.2	19,670.6
Eliminations
Current Assets:
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Deferred income taxes	0.0	0.0
Prepaid expenses and other current assets	0.0	0.0
Intercompany receivables	(9,579.7)	(39.2)
Total current assets	(9,579.7)	(39.2)
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	(32,337.1)	(16,177.6)
Intercompany loans receivable	(2,602.4)	(6,326.6)
Other assets	0.0	0.0
Total Assets	(44,519.2)	(22,543.4)
Current Liabilities:
Current maturities of long-term debt	0.0	0.0
Accounts payable	0.0	0.0
Accrued payroll and payroll-related costs	0.0	0.0
Accrued royalties	0.0	0.0
Accrued and other current liabilities	0.0	0.0
Intercompany payables	(9,579.7)	(39.2)
Total current liabilities	(9,579.7)	(39.2)
Long-term debt	0.0	0.0
Pension and postretirement benefits	0.0	0.0
Environmental liabilities	0.0	0.0
Deferred income taxes	0.0	0.0
Other income tax liabilities	0.0	0.0
Intercompany loans payable	(2,602.4)	(6,326.6)
Other liabilities	0.0	0.0
Total Liabilities	(12,182.1)	(6,365.8)
Shareholders' Equity	(32,337.1)	(16,177.6)
Total Liabilities and Shareholders' Equity	$ (44,519.2)	$ (22,543.4)