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Summary of Company's Balance Sheet Related Pension and Other Postretirement Benefit Plan (Detail) - USD ($)
$ in Thousands
Apr. 21, 2018
Dec. 30, 2017
Pension And Other Postretirement Benefit Expense [Abstract]    
Current liability $ 935 $ 935
Noncurrent liability 36,206 60,107
Accumulated other comprehensive loss, net of tax $ 81,768 $ 78,076