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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
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
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 1,997,953 $ 1,999,808 $ 1,995,929 $ 1,896,796 $ 1,886,730 $ 1,895,953 $ 2,542,375 $ 2,385,073 $ 8,536,065 $ 8,064,552 $ 7,963,799
Gross profit 286,733 290,361 289,007 245,390 256,142 265,660 377,729 343,214 1,243,830 1,110,406 1,144,909
Merger/acquisition and integration 73   582 1,406 521 804 782 2,206 1,437 4,937 8,101
Restructuring, asset impairment and other charges (gains) 2,835 1,296 14,581 32,277 232 (1,164) (5,662) 6,202 13,050 37,546 39,432
Postretirement benefit expense (income) 126 10,221 8,821 179 (6) (10) 635 (4) 19,803 159 (359)
Earnings (loss) before income taxes and discontinued operations 5,104 (1,966) (9,708) (19,501) 19,919 23,085 10,145 17,195 3,575 40,698 (131,644)
Earnings (loss) from continuing operations 5,473 (310) (6,767) (14,027) 17,545 17,838 7,521 12,435 5,917 33,791 (52,617)
(Loss) earnings from discontinued operations, net of taxes (49) (27) (47) 19 (80) (66) (52) (92) (175) (219) (228)
Net earnings (loss) $ 5,424 $ (337) $ (6,814) $ (14,008) $ 17,465 $ 17,772 $ 7,469 $ 12,343 $ 5,742 $ 33,572 $ (52,845)
Earnings (loss) from continuing operations per share:                      
Basic $ 0.15 $ (0.01) $ (0.19) $ (0.39) $ 0.49 $ 0.50 $ 0.21 $ 0.34 $ 0.16 $ 0.94 $ (1.41)
Diluted 0.15 (0.01) (0.19) (0.39) 0.49 0.50 0.21 0.34 0.16 0.94 (1.41)
Net earnings (loss) per share:                      
Basic 0.15 (0.01) (0.19) (0.39) 0.49 0.49 0.21 0.34 0.16 0.93 (1.41)
Diluted $ 0.15 $ (0.01) $ (0.19) $ (0.39) $ 0.49 $ 0.49 $ 0.21 $ 0.34 $ 0.16 $ 0.93 $ (1.41)
Dividends $ 6,907 $ 6,905 $ 6,902 $ 6,471 $ 6,469 $ 6,457 $ 6,902 $ 6,526 $ 27,616 $ 25,923 $ 24,704