Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Sep. 30, 2016		Jun. 24, 2016		Mar. 25, 2016		Dec. 25, 2015		Sep. 25, 2015		Jun. 26, 2015		Mar. 27, 2015		Dec. 26, 2014		Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 887.2		$ 866.6		$ 815.8		$ 811.2		$ 778.8		$ 768.5		$ 709.5		$ 666.3		$ 3,380.8	$ 2,923.1	$ 1,650.3
Gross profit	490.2		488.8		425.1		450.9		425.8		441.7		399.7		355.7		1,855.0	1,622.9	884.6
Income (loss) from continuing operations	110.0		176.7		98.5		103.8		73.1		34.6		55.3		73.6		489.0	236.6	(22.0)
Income (loss) from discontinued operations, net of income taxes	5.0		22.6		19.8		107.3		2.1		23.4		43.5		19.1		154.7	88.1	(297.3)
Net income (loss)	$ 115.0		$ 199.3		$ 118.3		$ 211.1		$ 75.2		$ 58.0		$ 98.8		$ 92.7		$ 643.7	$ 324.7	$ (319.3)
Basic earnings (loss) per share from continuing operations (in usd per share)	$ 1.02	[1]	$ 1.63	[1]	$ 0.89	[1]	$ 0.90	[1]	$ 0.62	[1]	$ 0.30	[1]	$ 0.47	[1]	$ 0.63	[1]	$ 4.42	$ 2.03	$ (0.34)
Diluted earnings (loss) per share from continuing operations (in usd per share)	$ 1.01	[1]	$ 1.62	[1]	$ 0.88	[1]	$ 0.89	[1]	$ 0.62	[1]	$ 0.29	[1]	$ 0.47	[1]	$ 0.63	[1]	$ 4.39	$ 2.00	$ (0.34)

[1] 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.