Summary of Company's Balance Sheet Related Pension and Other Postretirement Benefit Plan (Detail) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Pension And Other Postretirement Benefit Expense [Abstract]
Current benefit liability	$ 1,283	$ 935
Noncurrent benefit liability	39,149	60,107
Accumulated other comprehensive loss, net of tax	$ 105,036	$ 78,076

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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