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Divestiture - Additional Information (Detail) - USD ($) $ in Thousands |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 14, 2017 | Apr. 22, 2017 | Dec. 30, 2017
Business Combinations [Abstract] |  |  |
Date of business unit sold | Jan. 14, 2017 |  |
Sale of non-core mix manufacturing business | $ 44,000 |  |
Decrease in amount by working capital adjustment | 2,800 |  |
Gain on sale of business | 28,875 | $ 28,900 | $ 28,875
Net proceeds from divestiture of business | $ 41,200 |  | $ 41,230

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