Consolidated and Combined Statements of Income - USD ($) shares in Millions, $ in Millions		3 Months Ended																12 Months Ended
		Sep. 25, 2015		Jun. 26, 2015		Mar. 27, 2015		Dec. 26, 2014		Sep. 26, 2014		Jun. 27, 2014		Mar. 28, 2014		Dec. 27, 2013		Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Net sales		$ 882.4		$ 877.3		$ 819.0		$ 768.2		$ 673.7		$ 530.1		$ 448.7		$ 429.5		$ 3,346.9	$ 2,082.0	$ 1,712.3
Cost of sales																		1,493.3	1,021.8	890.0
Gross profit		482.1		503.8		462.9		404.8		363.2		254.1		226.7		216.2		1,853.6	1,060.2	822.3
Selling, general and administrative expenses																		1,169.8	745.0	495.9
Research and development expenses																		185.1	163.5	157.9
Separation costs																		0.0	9.6	74.2
Restructuring charges, net																		40.4	81.4	23.7
Non-restructuring impairment charges																		0.0	151.6	0.0
Gain on divestiture and license																		(3.5)	(15.0)	(2.9)
Operating income (loss)																		461.8	(75.9)	73.5
Interest expense																		(255.6)	(82.6)	(19.5)
Interest income																		1.0	1.5	0.3
Other income, net																		8.1	3.1	1.4
Income (loss) from continuing operations before income taxes	[1]																	215.3	(153.9)	55.7
Provision for (benefit from) income taxes	[1]																	(92.9)	(10.1)	47.5
Income (loss) from continuing operations		90.0		55.6		75.2		87.4		(173.5)		(29.0)		20.2		38.5		308.2	(143.8)	8.2
Income (loss) from discontinued operations, net of tax expense (benefit) of $11.5, $(34.7), and $21.1		(14.8)		2.4		23.6		5.3		(178.9)		4.9		(8.6)		7.1		16.5	(175.5)	50.6
Net income (loss)		$ 75.2		$ 58.0		$ 98.8		$ 92.7		$ (352.4)		$ (24.1)		$ 11.6		$ 45.6		$ 324.7	$ (319.3)	$ 58.8
Basic earnings per share (Note 8):
Income (Loss) from Continuing Operations, Per Basic Share		$ 0.77	[2]	$ 0.47	[2]	$ 0.64	[2]	$ 0.75	[2]	$ (2.04)	[2]	$ (0.50)	[2]	$ 0.35	[2]	$ 0.67	[2]	$ 2.64	$ (2.22)	$ 0.14
Earnings Per Share, Basic																		0.14	(2.70)	0.88
Net income (in usd per share)																		$ 2.78	$ (4.92)	$ 1.02
Weighted Average Number of Shares Outstanding, Basic																		115.8	64.9	57.7
Diluted earnings per share (Note 8):
Income (Loss) from Continuing Operations, Per Diluted Share		$ 0.76	[2]	$ 0.47	[2]	$ 0.64	[2]	$ 0.74	[2]	$ (2.04)	[2]	$ (0.50)	[2]	$ 0.34	[2]	$ 0.66	[2]	$ 2.61	$ (2.22)	$ 0.14
Earnings Per Share, Diluted																		0.14	(2.70)	0.88
Net income (in usd per share)																		$ 2.75	$ (4.92)	$ 1.02
Diluted weighted-average shares oustanding (in shares)																		117.2	64.9	57.8

[1] Domestic reflects U.K. in fiscal 2015, and U.S. federal and state in fiscal 2014 and fiscal 2013.

[2] Quarterly and annual computations are prepared independently. Therefore, the sum of each quarter may not necessarily total the fiscal period amounts noted elsewhere within this Annual Report on Form 10-K.