Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Sep. 30, 2011
Current: [Abstract]
Inventory	$ 5,293	$ 4,181
Bad debts	170	162
Accrued compensation and benefits	4,041	3,946
Product returns, allowances and warranty	1,916	1,222
Restructuring	606	515
Other - net	520	998
Current deferred tax assets	12,546	11,024
Less valuation allowance	(3,162)	(2,431)
Net current deferred tax assets	9,384	8,593
Long-term: [Abstract]
Intangible assets	6,638	7,660
Share-based and other deferred compensation	37,601	27,921
Net operating loss carry forwards	35,809	22,143
Federal tax credits	17,199	37,717
State tax credits	33,628	26,111
Other - net	1,785	0
Long-term deferred tax assets	132,660	121,552
Less valuation allowance	(43,791)	(36,943)
Net long-term deferred tax assets	88,869	84,609
Deferred tax assets	145,206	132,576
Less valuation allowance	46,953	39,374
Net deferred tax assets	98,253	93,202
Deferred Tax Liabilities [Abstract]
Prepaid insurance	(894)	(723)
Current deferred tax liabilities	(894)	(723)
Property, plant and equipment	(17,567)	(18,084)
Other - net	(3)	(208)
Intangible assets	(6,157)	(5,943)
Long-term deferred tax liabilities	(23,727)	(24,235)
Net deferred tax liabilities	(24,621)	(24,958)
Total deferred tax assets	$ 73,632	$ 68,244