Summary of Company's Balance Sheet Related Pension and Other Postretirement Benefit Plan (Detail) - USD ($) $ in Thousands	Oct. 06, 2018	Dec. 30, 2017
Pension And Other Postretirement Benefit Expense [Abstract]
Current liability	$ 935	$ 935
Noncurrent liability	41,075	60,107
Accumulated other comprehensive loss, net of tax	$ 107,292	$ 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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Balance Type:	credit
Period Type:	instant