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Income Taxes (Details 2) (USD $)	12 Months Ended			3 Months Ended		12 Months Ended
Income Taxes (Details 2) (USD $)	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Mar. 30, 2013 High end of range Forecast	Mar. 30, 2013 Low end of range Forecast	Dec. 29, 2012 Singapore	Dec. 31, 2011 Singapore	Jan. 01, 2011 Singapore	Dec. 29, 2012 State	Dec. 29, 2012 Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember Federal	Dec. 29, 2012 Ember
Operating loss and tax credit carryforwards
Operating loss carryforwards									$ 78,900,000	$ 90,800,000
Research and development credit carryforwards									9,900,000	2,000,000
Net deferred tax assets (Liabilities)	40,281,000	30,462,000									15,500,000
Valuation allowance	2,114,000										2,100,000
Income tax benefit reflected in earnings	$ (22,800,000)	$ (16,868,000)	$ (14,417,000)	$ 4,000,000	$ 3,500,000	$ (13,300,000)	$ 2,500,000	$ 6,100,000
The income tax benefit per diluted share (in dollars per share)						$ (0.31)	$ 0.06	$ 0.13

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.