Earnings per Share and Stock Repurchase Program (Details) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Mar. 29, 2020 USD ($) item $ / shares shares	Sep. 29, 2019 shares	Mar. 31, 2019 USD ($) item $ / shares shares	Sep. 29, 2019 shares	Feb. 06, 2019 USD ($)	Jul. 27, 2015 USD ($)
Net (loss) income
Net income	$ 32.0		$ 31.0
Shares
Shares (in shares) | shares	34,000,000.0		34,200,000
Per Share Amount
Net income (in dollars per share) | $ / shares	$ 0.94		$ 0.91
Dilutive securities, principally common stock options
Common stock equivalents (in shares) | shares	100,000
Net (loss) income
Net income	$ 32.0		$ 31.0
Weighted average number of shares:
Shares (in shares) | shares	34,100,000		34,200,000
Securities not included in the computation of diluted EPS
Net income (in dollars per share) | $ / shares	$ 0.94		$ 0.91
Dilutive securities, principally common stock options
Options to purchase shares of Class A common stock, anti-dilutive | shares		0		0
Shares repurchased
Number of shares repurchased | shares	174,707		74,409
Cost of shares repurchased	$ 14.7		$ 5.6
Number of stock repurchase programs | item	2		2
July 27, 2015
Shares repurchased
Value of shares of the entity's Class A common stock authorized to be repurchased						$ 100.0
Number of shares repurchased | shares			74,409
Cost of shares repurchased			$ 5.6
July 27, 2015 | Class A
Shares repurchased
Value of shares of the entity's Class A common stock authorized to be repurchased						$ 100.0
February 6, 2019
Shares repurchased
Value of shares of the entity's Class A common stock authorized to be repurchased					$ 150.0
Number of shares repurchased | shares	174,707
Cost of shares repurchased	$ 14.7
February 6, 2019 | Class A
Shares repurchased
Value of shares of the entity's Class A common stock authorized to be repurchased					$ 150.0
Remaining authorized repurchase amount	$ 127.6