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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. 29, 2018
Oct. 06, 2018
Jul. 14, 2018
Dec. 30, 2017
Oct. 07, 2017
Dec. 31, 2016
Oct. 08, 2016
Jul. 16, 2016
Apr. 21, 2018
Apr. 22, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                            
Loss (recovery) on inferior ingredients   $ 1,219 $ (1,891) $ 3,884               $ 3,212    
Gain on divestiture $ (28,875)                   $ (28,875)   $ (28,875)  
Restructuring and related impairment charges   7,210 497 801 $ 3,581 $ 100,549       $ 1,259   9,767 104,130  
Multi-employer pension plan withdrawal costs           18,268       2,322   2,322 18,268  
Pension plan settlement loss   1,148 $ 930 $ 1,035 1,619 $ 3,030 $ 173 $ 1,832 $ 4,641 4,668   7,781 4,649 $ 6,646
Income tax benefit resulting from tax reform         $ (48,160)             (5,575) $ (48,160)  
Impairment of assets   $ 3,516               $ 2,483   $ 5,999   $ 24,877