Income Taxes (Discussion of Valuation Allowance and Net Deferred Tax Assets) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 28, 2013	Dec. 29, 2012
Valuation Allowance [Line Items]
Tax provision related to intercompany sales of rights to intellectual property	$ 76,800,000
Tax provision related to the intercompany sale of inventory			13,700,000
Resulting tax benefit from realization of the benefit of a portion of remaining deferred tax assets	35,200,000
Resulting net deferred tax asset	49,700,000
Federal and state deferred tax assets		12,800,000
Increase (decrease) in valuation allowance		1,600,000
Deferred tax assets:
Accrued expenses and reserves		4,959,000	1,791,000
Stock-based and deferred compensation		4,986,000	4,164,000
Intangible assets		8,456,000	8,187,000
Fixed assets		828,000	0
Net operating loss carry forwards		101,144,000	113,259,000
Tax credit carry forwards		36,644,000	32,446,000
Capital loss carry forwards		6,698,000	6,926,000
Unrealized loss on securities		758,000	758,000
Other		143,000	121,000
Gross deferred tax assets		164,616,000	167,652,000
Less: valuation allowance		(150,528,000)	(149,209,000)
Net deferred tax assets		14,088,000	18,443,000
Deferred tax liabilities
Fixed assets		0	1,897,000
Other		969,000	608,000
Total deferred tax liabilities		969,000	2,505,000
Net deferred tax assets		13,119,000	15,938,000
Undistributed earnings of our Chinese subsidiary		3,400,000
Do not expire
Valuation Allowance [Line Items]
Tax credit carryforwards		24,400,000
Prepaid expenses and other current assets
Valuation Allowance [Line Items]
Net deferred tax assets, current		1,400,000	600,000
Federal
Valuation Allowance [Line Items]
Operating loss carryforwards		308,600,000
Tax credit carryforwards		18,000,000
State
Valuation Allowance [Line Items]
Operating loss carryforwards		147,000,000
Tax credit carryforwards		$ 26,300,000