Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 3.7	$ 3.6	$ 9.4
Charged to Income	1.9	0.4	1.1
Additions and Other	0.0	0.0	0.0
Deductions	(0.9)	(0.3)	(6.9)
Balance at End of Period	4.7	3.7	3.6
Sales reserve accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	404.9	287.7	235.0
Charged to Income	2,187.8	1,720.9	1,171.9
Additions and Other	1.3	30.6	0.0
Deductions	(2,194.7)	(1,634.3)	(1,119.2)
Balance at End of Period	399.3	404.9	287.7
Tax valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	76.9	28.3	15.3
Charged to Income	155.4	33.9	10.0
Additions and Other	0.2	14.7	3.0
Deductions	(0.5)	0.0	0.0
Balance at End of Period	$ 233.0	$ 76.9	$ 28.3