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Quarterly Financial Information (unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Jan. 02, 2021	Oct. 03, 2020	Jul. 11, 2020	Dec. 28, 2019	Oct. 05, 2019	Jul. 13, 2019	Apr. 18, 2020	Apr. 20, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 2,247,112	$ 2,060,816	$ 2,184,101	$ 1,997,953	$ 1,999,808	$ 1,995,929	$ 2,856,456	$ 2,542,375	$ 9,348,485	$ 8,536,065	$ 8,064,552
Gross profit	338,202	324,822	338,374	286,733	290,361	289,007	423,567	377,729	1,424,965	1,243,830	1,110,406
Merger/acquisition and integration				73		582		782	421	1,437	4,937
Restructuring, asset impairment and other charges (gains)	3,943	6,543	3,675	2,835	1,296	14,581	10,237	(5,662)	24,398	13,050	37,546
Postretirement benefit (income) expense				126	10,221	8,821		635	(685)	19,803	159
Earnings (loss) before income taxes and discontinued operations	14,030	25,516	30,385	5,104	(1,966)	(9,708)	15,433	10,145	85,364	3,575	40,698
Earnings (loss) from continuing operations				5,473	(310)	(6,767)		7,521	75,914	5,917	33,791
Loss from discontinued operations, net of taxes				(49)	(27)	(47)		(52)		(175)	(219)
Net earnings	$ 12,093	$ 19,952	$ 28,467	$ 5,424	$ (337)	$ (6,814)	$ 15,402	$ 7,469	$ 75,914	$ 5,742	$ 33,572
Earnings (loss) from continuing operations per share:
Basic earnings per share from continuing operations	$ 0.34	$ 0.56	$ 0.80	$ 0.15	$ (0.01)	$ (0.19)	$ 0.43	$ 0.21	$ 2.12	$ 0.16	$ 0.94
Diluted earnings per share from continuing operations	0.34	0.56	0.80	0.15	(0.01)	(0.19)	0.43	0.21	2.12	0.16	0.94
Net earnings (loss) per share:
Basic	0.34	0.56	0.80	0.15	(0.01)	(0.19)	0.43	0.21	2.12	0.16	0.93
Diluted	$ 0.34	$ 0.56	$ 0.80	$ 0.15	$ (0.01)	$ (0.19)	$ 0.43	$ 0.21	$ 2.12	$ 0.16	$ 0.93
Dividends	$ 6,905	$ 6,901	$ 6,898	$ 6,907	$ 6,905	$ 6,902	$ 6,997	$ 6,902	$ 27,701	$ 27,616	$ 25,923

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Balance Type:	credit
Period Type:	duration