Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 30, 2016	Mar. 25, 2016
Current Assets:
Cash and cash equivalents	$ 259.8	$ 342.0	$ 341.4
Accounts receivable, net	486.3	431.0
Inventories	358.8	350.7
Prepaid expenses and other current assets	188.4	131.9
Notes receivable	154.0	0.0
Current assets held for sale	0.0	310.9
Intercompany receivables	0.0	0.0
Total current assets	1,447.3	1,566.5
Property, plant and equipment, net	911.4	881.5
Goodwill	3,446.2	3,498.1
Intangible assets, net	8,778.9	9,000.5
Investment in subsidiaries	0.0	0.0
Intercompany loans receivable	0.0	0.0
Other assets	191.8	259.7
Total Assets	14,775.6	15,206.3
Current Liabilities:
Current maturities of long-term debt	244.9	271.2
Accounts payable	115.4	112.1
Accrued payroll and payroll-related costs	69.3	76.1
Accrued interest	80.8	68.7
Accrued and other current liabilities	525.8	658.8
Current liabilities held for sale	0.0	120.3
Intercompany payables	0.0	0.0
Total current liabilities	1,036.2	1,307.2
Long-term debt	5,699.9	5,880.8
Pension and postretirement benefits	67.5	136.4
Environmental liabilities	72.5	73.0
Deferred income taxes	2,338.1	2,398.1
Other income tax liabilities	71.8	70.4
Intercompany loans payable	0.0	0.0
Other liabilities	375.4	356.1
Total Liabilities	9,661.4	10,222.0
Shareholders' Equity	5,114.2	4,984.3
Total Liabilities and Shareholders' Equity	14,775.6	15,206.3
Mallinckrodt plc
Current Assets:
Cash and cash equivalents	0.4	0.5	0.1
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.7	1.0
Notes receivable	0.0	0.0
Current assets held for sale	0.0	0.0
Intercompany receivables	71.2	59.7
Total current assets	72.3	61.2
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	4,763.5	5,534.1
Intercompany loans receivable	904.4	3.5
Other assets	0.0	0.0
Total Assets	5,740.2	5,598.8
Current Liabilities:
Current maturities of long-term debt	0.0	0.0
Accounts payable	0.0	0.1
Accrued payroll and payroll-related costs	0.0	0.0
Accrued interest	0.0	0.0
Accrued and other current liabilities	1.2	1.9
Current liabilities held for sale	0.0	0.0
Intercompany payables	624.8	612.5
Total current liabilities	626.0	614.5
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	626.0	614.5
Shareholders' Equity	5,114.2	4,984.3
Total Liabilities and Shareholders' Equity	5,740.2	5,598.8
Mallinckrodt International Finance S.A.
Current Assets:
Cash and cash equivalents	130.3	44.5	137.9
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.3	0.0
Notes receivable	0.0	0.0
Current assets held for sale	0.0	0.0
Intercompany receivables	19.5	65.1
Total current assets	150.1	109.6
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	21,387.3	20,624.1
Intercompany loans receivable	0.0	0.0
Other assets	0.0	0.0
Total Assets	21,537.4	20,733.7
Current Liabilities:
Current maturities of long-term debt	18.3	19.7
Accounts payable	0.8	0.1
Accrued payroll and payroll-related costs	0.0	0.0
Accrued interest	79.2	53.9
Accrued and other current liabilities	9.2	7.5
Current liabilities held for sale	0.0	0.0
Intercompany payables	471.7	467.1
Total current liabilities	579.2	548.3
Long-term debt	5,679.9	5,860.6
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	4,961.1	3,329.4
Other liabilities	7.2	7.0
Total Liabilities	11,227.4	9,745.3
Shareholders' Equity	10,310.0	10,988.4
Total Liabilities and Shareholders' Equity	21,537.4	20,733.7
Other Subsidiaries
Current Assets:
Cash and cash equivalents	129.1	297.0	203.4
Accounts receivable, net	486.3	431.0
Inventories	358.8	350.7
Prepaid expenses and other current assets	187.4	130.9
Notes receivable	154.0	0.0
Current assets held for sale	0.0	310.9
Intercompany receivables	1,101.1	1,081.3
Total current assets	2,416.7	2,601.8
Property, plant and equipment, net	911.4	881.5
Goodwill	3,446.2	3,498.1
Intangible assets, net	8,778.9	9,000.5
Investment in subsidiaries	10,310.0	10,988.5
Intercompany loans receivable	4,056.7	3,325.9
Other assets	191.8	259.7
Total Assets	30,111.7	30,556.0
Current Liabilities:
Current maturities of long-term debt	226.6	251.5
Accounts payable	114.6	111.9
Accrued payroll and payroll-related costs	69.3	76.1
Accrued interest	1.6	14.8
Accrued and other current liabilities	515.4	649.4
Current liabilities held for sale	0.0	120.3
Intercompany payables	95.3	126.5
Total current liabilities	1,022.8	1,350.5
Long-term debt	20.0	20.2
Pension and postretirement benefits	67.5	136.4
Environmental liabilities	72.5	73.0
Deferred income taxes	2,338.1	2,398.1
Other income tax liabilities	71.8	70.4
Intercompany loans payable	0.0	0.0
Other liabilities	368.2	349.1
Total Liabilities	3,960.9	4,397.7
Shareholders' Equity	26,150.8	26,158.3
Total Liabilities and Shareholders' Equity	30,111.7	30,556.0
Eliminations
Current Assets:
Cash and cash equivalents	0.0	0.0	$ 0.0
Accounts receivable, net	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	0.0	0.0
Notes receivable	0.0	0.0
Current assets held for sale	0.0	0.0
Intercompany receivables	(1,191.8)	(1,206.1)
Total current assets	(1,191.8)	(1,206.1)
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiaries	(36,460.8)	(37,146.7)
Intercompany loans receivable	(4,961.1)	(3,329.4)
Other assets	0.0	0.0
Total Assets	(42,613.7)	(41,682.2)
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 interest	0.0	0.0
Accrued and other current liabilities	0.0	0.0
Current liabilities held for sale	0.0	0.0
Intercompany payables	(1,191.8)	(1,206.1)
Total current liabilities	(1,191.8)	(1,206.1)
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	(4,961.1)	(3,329.4)
Other liabilities	0.0	0.0
Total Liabilities	(6,152.9)	(4,535.5)
Shareholders' Equity	(36,460.8)	(37,146.7)
Total Liabilities and Shareholders' Equity	$ (42,613.7)	$ (41,682.2)