Significant Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Current:
Federal	$ 25,115	$ 18,510	$ 4,471
State	9,455	8,084	4,894
Total current	34,570	26,594	9,365
Deferred:
Federal	16,363	8,081	12,860
State	1,337	(346)	1,398
Total deferred	17,700	7,735	14,258
Total provision for income taxes	$ 52,270	$ 34,329	$ 23,623