Income Taxes - Altera Corp and Singapore Operations (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Taxes
Transition Tax obligation	$ 21.3
Period for payment of transition tax	8 years
Altera case
Income Taxes
Discrete income tax expense	$ 27.2
Singapore
Income Taxes
Foreign income tax expense (benefit)	$ (1.5)	$ (5.4)	$ (11.0)
Income (loss) per diluted share (in dollars per share)	$ 0.03	$ 0.12	$ 0.25