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Summary of Company's Balance Sheet Related Pension and Other Postretirement Benefit Plan (Detail) - USD ($) $ in Thousands | Apr. 20, 2019 | Dec. 29, 2018
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Pension And Other Postretirement Benefit Expense [Abstract] |  |
Current liability | $ 1,283 | $ 1,283
Noncurrent liability | 37,664 | 39,149
Accumulated other comprehensive loss, net of tax | $ 103,388 | $ 105,036

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