Income Taxes (Discussion of Valuation Allowance and Net Deferred Tax Assets) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	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			30,100,000
Increase (decrease) in valuation allowance			1,700,000
Deferred tax assets:
Accrued expenses and reserves		4,011,000	1,791,000
Inventory		4,036,000	0
Deferred revenue		13,047,000	0
Stock-based and deferred compensation		3,716,000	4,164,000
Intangible assets		9,277,000	8,187,000
Fixed assets		124,000	0
Net operating loss carry forwards		125,013,000	127,400,000
Tax credit carry forwards		31,768,000	32,446,000
Capital loss carry forwards		6,916,000	6,926,000
Unrealized loss on securities		925,000	758,000
Other		81,000	120,000
Gross deferred tax assets		198,914,000	181,792,000
Less: valuation allowance		(147,499,000)	(149,209,000)
Net deferred tax assets		51,415,000	32,583,000
Deferred tax liabilities
Fixed assets		0	1,897,000
Prepaid expenses		768,000	0
Other		977,000	608,000
Total deferred tax liabilities		1,745,000	2,505,000
Net deferred tax assets		49,670,000	30,078,000
Undistributed earnings of our Chinese subsidiary			2,000,000
Do not expire
Valuation Allowance [Line Items]
Tax credit carryforwards			22,100,000
Prepaid expenses and other current assets
Valuation Allowance [Line Items]
Net deferred tax assets, current		4,500,000	900,000
Federal
Valuation Allowance [Line Items]
Operating loss carryforwards			296,900,000
Tax credit carryforwards			14,100,000
State
Valuation Allowance [Line Items]
Operating loss carryforwards			173,400,000
Tax credit carryforwards			$ 24,800,000