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Financial Results that Impact Comparability by Quarter (Detail) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
Jan. 14, 2017
Dec. 28, 2019
Oct. 05, 2019
Jul. 13, 2019
Dec. 29, 2018
Oct. 06, 2018
Jul. 14, 2018
Dec. 30, 2017
Oct. 07, 2017
Apr. 20, 2019
Apr. 21, 2018
Apr. 22, 2017
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                              
(Recovery) loss on inferior ingredients   $ 376     $ 1,219 $ (1,891) $ 3,884     $ (413)     $ (37) $ 3,212  
Gain on divestiture $ (28,875)                     $ (28,900)     $ (28,875)
Restructuring and related impairment charges   $ 17,482 $ 3,277 $ 2,047 7,210 497 801     $ 718 $ 1,259   23,524 9,767 104,130
Multi-employer pension plan withdrawal costs                     2,322     2,322 18,268
Pension plan settlement loss         1,148 $ 930 $ 1,035 $ 1,619 $ 3,030   4,668   $ 0 7,781 4,649
Income tax benefit resulting from tax reform               $ (48,200)           (5,575) $ (48,160)
Impairment of assets         $ 3,516           $ 2,483     $ 5,999