Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 07, 2019	Jun. 15, 2019	Mar. 23, 2019	Sep. 08, 2018	Jun. 16, 2018	Mar. 24, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Tax expense at statutory federal rate									$ 2,518	$ 4,303	$ 11,673
Current:
Federal									(79)	(306)	409
State									681	797	263
Total current									602	491	672
Deferred:
Federal									2,328	4,093	4,501
State									313	778	829
Foreign									0	89	(79)
Total deferred									2,641	4,960	5,251
Provision for income taxes	$ 2,246	$ 2,151	$ (986)	$ 2,284	$ 2,149	$ (436)	$ (168)	$ 1,455	$ 3,243	$ 5,451	$ 5,923