Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2017	Sep. 27, 2017	Jun. 28, 2017	Mar. 29, 2017	Dec. 28, 2016	Sep. 28, 2016	Jun. 29, 2016	Mar. 30, 2016	Dec. 27, 2017	Dec. 28, 2016	Dec. 30, 2015
Current income taxes:
Federal									$ 0	$ 0	$ 0
State									250	224	188
Total current									250	224	188
Deferred income taxes:
Federal									1,495	9,660	8,871
State									192	2,730	6,378
Total deferred									1,687	12,390	15,249
Charge in lieu of tax (attributable to stock options)									0	169	5,420
Adjustment to deferred taxes for tax rate change									(1,440)	0	0
Tax provision for income taxes	$ (4,757)	$ (2,457)	$ 4,244	$ 3,467	$ 853	$ 2,830	$ 5,339	$ 3,761	$ 497	$ 12,783	$ 20,857