Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 28,832	$ 88,137	$ 101,650	$ 174,886
Weighted average shares outstanding for basic earnings per share	166,663	166,684	167,320	166,150
Dilutive effect of stock options computed using the treasury stock method and the average market price	3,886	5,363	4,276	5,303
Weighted average shares outstanding for diluted earnings per share	170,549	172,047	171,596	171,453
Basic earnings per share	$ 0.17	$ 0.53	$ 0.61	$ 1.05
Diluted earnings per share	$ 0.17	$ 0.51	$ 0.59	$ 1.02
Antidilutive securities excluded from the computation of diluted earnings per share	2,530	1,532