Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Operating loss and tax credit carryforwards
Net deferred tax assets (Liabilities)	$ 23,511	$ 27,590
Provision for U.S. federal and state income taxes	0
Income tax benefit reflected in earnings	(677)	(11,019)	$ (12,208)
Singapore
Operating loss and tax credit carryforwards
Income tax benefit reflected in earnings	$ 14,400	$ 2,000	$ 2,200
The income tax benefit (Expense) per diluted share (in dollars per share)	$ 0.34	$ 0.05	$ 0.05
Federal
Operating loss and tax credit carryforwards
Research and development tax credit carryforwards	$ 5,100
State
Operating loss and tax credit carryforwards
Operating loss carryforwards	54,000
Research and development tax credit carryforwards	12,500
Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember | Federal
Operating loss and tax credit carryforwards
Operating loss carryforwards	53,800
Research and development tax credit carryforwards	2,000
Energy Micro | Foreign
Operating loss and tax credit carryforwards
Operating loss carryforwards	15,800
Bluegiga | Foreign
Operating loss and tax credit carryforwards
Operating loss carryforwards	$ 200