For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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

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- Definition

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

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Income Taxes (Details 2) (USD $)	12 Months Ended
Income Taxes (Details 2) (USD $)	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Operating loss and tax credit carryforwards
Net deferred tax assets (Liabilities)	$ 30,462,000	$ 17,666,000
Income tax benefit reflected in earnings	(16,868,000)	(14,417,000)	4,126,000
Singapore
Operating loss and tax credit carryforwards
Income tax benefit reflected in earnings	2,500,000	6,100,000	6,300,000
The income tax benefit per diluted share (in dollars per share)	$ 0.06	$ 0.13	$ 0.13
State
Operating loss and tax credit carryforwards
Operating loss carryforwards	60,600,000
Research and development credit carryforwards	8,000,000
Cygnal Integrated Products, Silicon Clocks and Spectra Linear \| Federal
Operating loss and tax credit carryforwards
Operating loss carryforwards	52,500,000
Research and development credit carryforwards	300,000
Silicon Clocks, Inc
Operating loss and tax credit carryforwards
Net deferred tax assets (Liabilities)	900,000
Spectra Linear
Operating loss and tax credit carryforwards
Net deferred tax assets (Liabilities)	$ 12,200,000