Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Operating loss and tax credit carryforwards
Net deferred tax assets (Liabilities)	$ 31,336,000	$ 40,281,000
Provision for U.S. federal and state income taxes	0
Income tax benefit reflected in earnings	(12,208,000)	(22,800,000)	(16,868,000)
Singapore
Operating loss and tax credit carryforwards
Income tax benefit reflected in earnings	2,200,000	(13,300,000)	2,500,000
The income tax benefit per diluted share (in dollars per share)	$ 0.05	$ (0.31)	$ 0.06
State
Operating loss and tax credit carryforwards
Operating loss carryforwards	63,900,000
Research and development credit carryforwards	11,000,000
Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember | Federal
Operating loss and tax credit carryforwards
Operating loss carryforwards	77,500,000
Research and development credit carryforwards	2,100,000
Energy Micro
Operating loss and tax credit carryforwards
Net deferred tax assets (Liabilities)	5,300,000
Energy Micro | Foreign
Operating loss and tax credit carryforwards
Operating loss carryforwards	$ 29,600,000