Leases - Summary of Lease Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Leases [Abstract]
Operating lease expense	$ 7,732	$ 7,362
Short-term lease expense	3,647	4,547
Total lease expense	$ 11,379	$ 11,909