Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 25, 2015	Dec. 26, 2014
Condensed Consolidating Financial Statements
Net sales	$ 914.8	$ 768.2
Cost of sales	423.1	363.4
Gross profit	491.7	404.8
Selling, general and administrative expenses	242.5	224.1
Research and development expenses	63.6	52.7
Restructuring charges, net	6.3	7.2
Gain on Divestiture	(0.1)	(0.8)
Operating (loss) income	179.4	121.6
Interest expense	(97.8)	(48.8)
Interest income	0.2	0.1
Other income (expense), net	2.0	4.2
Intercompany fees	0.0	0.0
Equity in net income of subsidiaries	0.0	0.0
Income from continuing operations before income taxes	83.8	77.1
Income tax benefit	(32.1)	(10.3)
Income from continuing operations	115.9	87.4
Income from discontinued operations, net of income taxes	95.2	5.3
Net income	211.1	92.7
Other comprehensive loss, net of tax	(66.2)	(21.3)
Comprehensive income	144.9	71.4
Mallinckrodt plc
Condensed Consolidating Financial Statements
Net sales	0.0	0.0
Cost of sales	0.0	0.0
Gross profit	0.0	0.0
Selling, general and administrative expenses	10.4	30.7
Research and development expenses	0.0	0.0
Restructuring charges, net	0.0	6.8
Gain on Divestiture	0.0	0.0
Operating (loss) income	(10.4)	(37.5)
Interest expense	(68.0)	0.0
Interest income	0.0	0.0
Other income (expense), net	67.7	3.5
Intercompany fees	(3.2)	(1.9)
Equity in net income of subsidiaries	211.0	128.6
Income from continuing operations before income taxes	197.1	92.7
Income tax benefit	(14.0)	0.0
Income from continuing operations	211.1	92.7
Income from discontinued operations, net of income taxes	0.0	0.0
Net income	211.1	92.7
Other comprehensive loss, net of tax	(66.2)	(21.3)
Comprehensive income	144.9	71.4
Mallinckrodt International Finance S.A.
Condensed Consolidating Financial Statements
Net sales	0.0	0.0
Cost of sales	0.0	0.0
Gross profit	0.0	0.0
Selling, general and administrative expenses	0.3	0.1
Research and development expenses	0.0	0.0
Restructuring charges, net	0.0	0.0
Gain on Divestiture	0.0	0.0
Operating (loss) income	(0.3)	(0.1)
Interest expense	(81.9)	(48.7)
Interest income	0.0	0.0
Other income (expense), net	1.7	0.0
Intercompany fees	(0.1)	0.0
Equity in net income of subsidiaries	312.0	177.4
Income from continuing operations before income taxes	231.4	128.6
Income tax benefit	0.0	0.0
Income from continuing operations	231.4	128.6
Income from discontinued operations, net of income taxes	40.3	0.0
Net income	271.7	128.6
Other comprehensive loss, net of tax	(66.2)	(21.3)
Comprehensive income	205.5	107.3
Other Subsidiaries
Condensed Consolidating Financial Statements
Net sales	914.8	768.2
Cost of sales	423.1	363.4
Gross profit	491.7	404.8
Selling, general and administrative expenses	231.8	193.3
Research and development expenses	63.6	52.7
Restructuring charges, net	6.3	0.4
Gain on Divestiture	(0.1)	(0.8)
Operating (loss) income	190.1	159.2
Interest expense	(21.0)	(0.1)
Interest income	73.3	0.1
Other income (expense), net	(67.4)	0.7
Intercompany fees	3.3	1.9
Equity in net income of subsidiaries	271.7	128.6
Income from continuing operations before income taxes	450.0	290.4
Income tax benefit	(18.1)	(10.3)
Income from continuing operations	468.1	300.7
Income from discontinued operations, net of income taxes	54.9	5.3
Net income	523.0	306.0
Other comprehensive loss, net of tax	(132.5)	(42.7)
Comprehensive income	390.5	263.3
Eliminations
Condensed Consolidating Financial Statements
Net sales	0.0	0.0
Cost of sales	0.0	0.0
Gross profit	0.0	0.0
Selling, general and administrative expenses	0.0	0.0
Research and development expenses	0.0	0.0
Restructuring charges, net	0.0	0.0
Gain on Divestiture	0.0	0.0
Operating (loss) income	0.0	0.0
Interest expense	73.1	0.0
Interest income	(73.1)	0.0
Other income (expense), net	0.0	0.0
Intercompany fees	0.0	0.0
Equity in net income of subsidiaries	(794.7)	(434.6)
Income from continuing operations before income taxes	(794.7)	(434.6)
Income tax benefit	0.0	0.0
Income from continuing operations	(794.7)	(434.6)
Income from discontinued operations, net of income taxes	0.0	0.0
Net income	(794.7)	(434.6)
Other comprehensive loss, net of tax	198.7	64.0
Comprehensive income	$ (596.0)	$ (370.6)