Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock Capital Stock, Class A common stock	Common Stock Capital Stock, Class B common stock	Treasury Stock Treasury Stock, Class A common stock	Treasury Stock Treasury Stock, Class B common stock	Paid-in Capital	Earnings Invested in the Business	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustment Earnings Invested in the Business
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 29, 2019		$ 36.6	$ 3.5	$ (20.3)	$ (0.6)	$ 22.5	$ 1,238.6	$ (15.8)	$ (0.7)
Increase (Decrease) in Stockholders' Equity
Net issuance of stock awards				3.7	0.0	(1.9)
Net earnings (loss)	$ (95.4)						(95.4)
Dividends							(3.0)
Other comprehensive income (loss), net of tax	(1.1)							(1.1)
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 27, 2020	1,166.1	36.6	3.5	(16.6)	(0.6)	20.6	1,139.5	(16.9)
Stockholders' Equity Attributable to Parent, Beginning Balance at Jun. 28, 2020		36.6	3.5	(16.7)	(0.6)	20.5	1,122.8	(20.5)
Increase (Decrease) in Stockholders' Equity
Net issuance of stock awards				0.1	0.0	0.1
Net earnings (loss)	16.7						16.7
Dividends							0.0
Other comprehensive income (loss), net of tax	3.6							3.6
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 27, 2020	1,166.1	36.6	3.5	(16.6)	(0.6)	20.6	1,139.5	(16.9)
Increase (Decrease) in Stockholders' Equity
Earnings invested in the business	1,162.9
Stockholders' Equity Attributable to Parent, Beginning Balance at Jan. 03, 2021	1,203.0	36.7	3.4	(16.5)	(0.6)	21.3	1,162.9	(4.2)
Increase (Decrease) in Stockholders' Equity
Net issuance of stock awards				1.9	0.0	1.9
Net earnings (loss)	84.4						84.4
Dividends							(2.0)
Other comprehensive income (loss), net of tax	(15.1)							(15.1)
Stockholders' Equity Attributable to Parent, Ending Balance at Oct. 03, 2021	1,274.1	36.7	3.4	(14.6)	(0.6)	23.2	1,245.3	(19.3)
Stockholders' Equity Attributable to Parent, Beginning Balance at Jul. 04, 2021		36.7	3.4	(14.7)	(0.6)	22.3	1,212.5	(15.8)
Increase (Decrease) in Stockholders' Equity
Net issuance of stock awards				0.1	0.0	0.9
Net earnings (loss)	34.8						34.8
Dividends							(2.0)
Other comprehensive income (loss), net of tax	(3.5)							(3.5)
Stockholders' Equity Attributable to Parent, Ending Balance at Oct. 03, 2021	1,274.1	$ 36.7	$ 3.4	$ (14.6)	$ (0.6)	$ 23.2	$ 1,245.3	$ (19.3)
Increase (Decrease) in Stockholders' Equity
Earnings invested in the business	$ 1,245.3