Goodwill and Intangible Assets - Schedule of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Balance at beginning of period	$ 74,458	$ 72,606
Goodwill acquired	16,622
Measurement period adjustment		1,852
Balance at end of period	$ 91,080	$ 74,458