Goodwill and Intangible Assets - Schedule of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 30, 2019	Dec. 29, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Balance at beginning of period	$ 72,606	$ 65,999
Goodwill acquired		6,800
Measurement period adjustments	(5)	(193)
Balance at end of period	$ 72,601	$ 72,606