Income Taxes - Altera Corp and Singapore Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Taxes
Net deferred tax assets	$ 35,514	$ 36,174
Income tax benefit	(11,430)	29,811	$ 3,002
Altera decision
Income Taxes
Net deferred tax assets	27,200
Singapore
Income Taxes
Income tax benefit	$ (5,400)	$ (11,000)	$ (7,700)
Income tax benefit (expense) per diluted share (in dollars per share)	$ 0.12	$ 0.25	$ 0.18