Summary of Company's Balance Sheet Related Pension and Other Postretirement Benefit Plan (Detail) - USD ($) $ in Thousands	Oct. 03, 2020	Dec. 28, 2019
Pension And Other Postretirement Benefit Expense [Abstract]
Noncurrent asset	$ 2,467
Current liability	926	$ 29,380
Noncurrent liability	9,009	14,328
Accumulated other comprehensive loss, net of tax	$ 4,060	$ 107,678