Commitments and Contingencies Commitments and Contingencies (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009	Aug. 31, 2012 Astria Semiconductor Holdings, Inc. [Member] Subsequent Event [Member]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$ 593,000								$ 593,000
Capital Leases, Future Minimum Payments Due in Two and Three Years	321,000								321,000
Capital Leases, Future Minimum Payments Due in Four and Five Years	29,000								29,000
Capital Leases, Future Minimum Payments Due Thereafter	0								0
Capital Leases, Future Minimum Payments Due	943,000								943,000
Capital Leases Future Minimum Payments Executory and Interest Costs	(30,000)								(30,000)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	913,000								913,000
Capital Lease Obligations, Current	(573,000)				0				(573,000)	0
Capital Lease Obligations, Noncurrent	340,000				0				340,000	0
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	3,658,000								3,658,000
Operating Leases, Future Minimum Payments, Due in Two and Three Years	5,700,000								5,700,000
Operating Leases, Future Minimum Payments, Due in Four and Five Years	5,016,000								5,016,000
Operating Leases, Future Minimum Payments, Due Thereafter	10,034,000								10,034,000
Operating Leases, Future Minimum Payments Due	24,408,000								24,408,000
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase Obligation, Due in Next Twelve Months	12,402,000								12,402,000
Purchase Obligation, Due in Second and Third Year	4,950,000								4,950,000
Purchase Obligation, Due in Fourth and Fifth Year	50,000								50,000
Purchase Obligation, Due after Fifth Year	0								0
Purchase Obligation	17,402,000								17,402,000
Operating Leases, Rent Expense, Net									4,700,000	4,800,000	5,400,000
Unrecognized Tax Benefits	17,181,000				17,752,000				17,181,000	17,752,000	17,500,000	17,925,000
Loss Contingency Accrual, at Carrying Value	1,000,000	300,000							1,000,000
Percentage of voting interests acquired													100.00%
Gain (Loss) Related to Litigation Settlement	$ 3,250,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 3,250,000	$ 0	$ 0