Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016	Jul. 27, 2015
Net (loss) income
Net income	$ 21.7	$ 16.2
Shares
Shares (in shares)	34,400,000	34,400,000
Per Share Amount
Net income (in dollars per share)	$ 0.63	$ 0.47
Dilutive securities, principally common stock options
Common stock equivalents (in shares)	100,000	100,000
Net (loss) income
Net income	$ 21.7	$ 16.2
Weighted average number of shares:
Shares (in shares)	34,500,000	34,500,000
Per Share Amount
Net income (in dollars per share)	$ 0.63	$ 0.47
Shares repurchased
Options to purchase shares of Class A common stock	100,000	200,000
Cost of shares repurchased	$ 4.4	$ 12.5
Class A
Shares repurchased
Total value of shares of the entity's Class A common stock authorized to be repurchased			$ 100.0
Remaining authorized repurchase amount	$ 51.6
July 27, 2015 | Class A
Shares repurchased
Number of shares repurchased	69,112	267,931
Cost of shares repurchased	$ 4.4	$ 12.5