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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

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