Valuation and Qualiifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 03, 2014		Sep. 27, 2013	Sep. 28, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 0.5		$ 0.5	$ 0.8
Charged to Cost and Expenses	0.2		0.2	0.3
Deductions	0.1		(0.2)	(0.5)
Misc.	0	[1]		0	[1]
Ending Balance	0.8		0.5	0.5
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	4.7		6.4	3.3
Charged to Cost and Expenses	12.7		3.1	8.5
Deductions	(3.3)		(4.8)	(6.1)
Misc.	0	[1]	0	0.7	[1]
Ending Balance	14.1		4.7	6.4
Inventory Valuation Reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	14.5		18.3	11.5
Charged to Cost and Expenses	24.6		12.6	6.6
Deductions	(17.2)		(16.4)	(7.6)
Misc.	0	[1]	0	7.8	[1]
Ending Balance	$ 21.9		$ 14.5	$ 18.3

[1] Includes acquired balances