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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Dec. 28, 2019	Oct. 05, 2019	Jul. 13, 2019	Dec. 29, 2018	Oct. 06, 2018	Jul. 14, 2018	Apr. 20, 2019	Apr. 21, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Net income	$ 95,907	$ 123,669	$ 124,820	$ 53,441	$ 115,843	$ 117,836	$ 142,500	$ 136,727	$ 486,896	$ 423,847	$ 475,505
Other comprehensive income (loss):
Changes in net unrecognized other postretirement benefit costs, net of tax of $67, $103 and $126									(142)	(294)	(194)
Currency translation adjustments									9,766	(18,945)	14,941
Total other comprehensive income (loss)									9,624	(19,239)	14,747
Comprehensive income									$ 496,520	$ 404,608	$ 490,252