Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Statements of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 26, 2014	Dec. 27, 2013
Condensed Consolidating Financial Statements
Net sales	$ 866.3	$ 540.2
Cost of sales	427.6	284.6
Gross profit	438.7	255.6
Selling, general and administrative expenses	262.5	146.2
Research and development expenses	42.4	39.0
Separation costs	0	2.2
Restructuring charges, net	7.2	8.0
Gains on divestiture and license	(0.8)	(12.9)
Operating (loss) income	127.4	73.1
Interest expense	(48.8)	(9.8)
Interest income	0.1	0.3
Other income (expense), net	4.1	(0.6)
Intercompany interest and fees	0	0
Equity in net income of subsidiaries	0	0
Income from continuing operations before income taxes	82.8	63.0
Income tax (benefit) expense	(9.3)	16.6
Income from continuing operations	92.1	46.4
Income (loss) from discontinued operations, net of income taxes	0.6	(0.8)
Net income	92.7	45.6
Other comprehensive loss, net of tax	(21.3)	0.2
Comprehensive income	71.4	45.8
Mallinckrodt plc
Condensed Consolidating Financial Statements
Net sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	30.7	4.0
Research and development expenses	0	0
Separation costs		0.8
Restructuring charges, net	6.8	0
Gains on divestiture and license	0	0
Operating (loss) income	(37.5)	(4.8)
Interest expense	0	0
Interest income	0	0
Other income (expense), net	3.5	0.7
Intercompany interest and fees	(1.9)	(3.1)
Equity in net income of subsidiaries	128.6	52.6
Income from continuing operations before income taxes	92.7	45.4
Income tax (benefit) expense	0	(0.2)
Income from continuing operations	92.7	45.6
Income (loss) from discontinued operations, net of income taxes	0	0
Net income	92.7	45.6
Other comprehensive loss, net of tax	(21.3)	0.2
Comprehensive income	71.4	45.8
Mallinckrodt International Finance S.A.
Condensed Consolidating Financial Statements
Net sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	0.1	0.1
Research and development expenses	0	0
Separation costs		0
Restructuring charges, net	0	0
Gains on divestiture and license	0	0
Operating (loss) income	(0.1)	(0.1)
Interest expense	(48.7)	(10.5)
Interest income	0	0
Other income (expense), net	0	0
Intercompany interest and fees	0	0
Equity in net income of subsidiaries	177.4	63.2
Income from continuing operations before income taxes	128.6	52.6
Income tax (benefit) expense	0	0
Income from continuing operations	128.6	52.6
Income (loss) from discontinued operations, net of income taxes	0	0
Net income	128.6	52.6
Other comprehensive loss, net of tax	(21.3)	0.2
Comprehensive income	107.3	52.8
Other Subsidiaries
Condensed Consolidating Financial Statements
Net sales	866.3	540.2
Cost of sales	427.6	284.6
Gross profit	438.7	255.6
Selling, general and administrative expenses	231.7	142.1
Research and development expenses	42.4	39.0
Separation costs		1.4
Restructuring charges, net	0.4	8.0
Gains on divestiture and license	(0.8)	(12.9)
Operating (loss) income	165.0	78.0
Interest expense	(0.1)	0.7
Interest income	0.1	0.3
Other income (expense), net	0.6	(1.3)
Intercompany interest and fees	1.9	3.1
Equity in net income of subsidiaries	128.6	0
Income from continuing operations before income taxes	296.1	80.8
Income tax (benefit) expense	(9.3)	16.8
Income from continuing operations	305.4	64.0
Income (loss) from discontinued operations, net of income taxes	0.6	(0.8)
Net income	306.0	63.2
Other comprehensive loss, net of tax	(42.7)	0.1
Comprehensive income	263.3	63.3
Eliminations
Condensed Consolidating Financial Statements
Net sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	0	0
Research and development expenses	0	0
Separation costs		0
Restructuring charges, net	0	0
Gains on divestiture and license	0	0
Operating (loss) income	0	0
Interest expense	0	0
Interest income	0	0
Other income (expense), net	0	0
Intercompany interest and fees	0	0
Equity in net income of subsidiaries	(434.6)	(115.8)
Income from continuing operations before income taxes	(434.6)	(115.8)
Income tax (benefit) expense	0	0
Income from continuing operations	(434.6)	(115.8)
Income (loss) from discontinued operations, net of income taxes	0	0
Net income	(434.6)	(115.8)
Other comprehensive loss, net of tax	64.0	(0.3)
Comprehensive income	$ (370.6)	$ (116.1)