Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2015		Oct. 03, 2014	Sep. 27, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 0.8		$ 0.5	$ 0.5
Charged to Cost and Expenses	(0.4)		(0.2)	(0.2)
Deductions	0.0		0.1	0.2
Misc.	0.0	[1]	0.0	0.0	[1]
Ending Balance	0.4		0.8	0.5
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	14.1		4.7	6.4
Charged to Cost and Expenses	(16.0)		(12.7)	(3.1)
Deductions	17.9		3.3	4.8
Misc.	0.0	[1]	0.0	0.0	[1]
Ending Balance	12.2		14.1	4.7
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	60.8		51.0	47.0
Charged to Cost and Expenses	(3.6)		(7.1)	(4.0)
Deductions	0.0		0.0	0.0
Misc.	0.8	[1]	2.7	0.0	[1]
Ending Balance	$ 65.2		$ 60.8	$ 51.0

[1] Includes acquired balances