Stockholders' Equity - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Class of Stock [Line Items]
Dividends	$ 11.6	$ 10.7	$ 7.7
Class A common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000
Class B common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	10,000,000