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Summary of Company's Balance Sheet Related Pension and Other Postretirement Benefit Plan (Detail) - USD ($)
$ in Thousands
Apr. 18, 2020
Dec. 28, 2019
Pension And Other Postretirement Benefit Expense [Abstract]    
Current liability $ 926 $ 29,380
Noncurrent liability 14,344 14,328
Accumulated other comprehensive loss, net of tax $ 4,112 $ 107,678