Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) - Successor - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		6 Months Ended	12 Months Ended
	Sep. 11, 2018	Jun. 19, 2018	Mar. 27, 2018	Sep. 12, 2017	Jun. 20, 2017	Mar. 28, 2017	Jan. 01, 2019	Jan. 02, 2018	Dec. 29, 2015	Jan. 01, 2019	Jan. 02, 2018	Jan. 03, 2017
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 117,830	$ 117,813	$ 112,554	$ 110,988	$ 108,581	$ 105,345	$ 157,293	$ 146,542		$ 505,490	$ 471,456	$ 452,083
Income from operations	9,195	7,804	6,338	9,533	10,276	8,613	10,696	12,825		34,033	41,247	43,300
Net income	$ 5,874	$ 4,210	$ 3,229	$ 5,101	$ 5,330	$ 4,238	$ 5,646	$ 35,202	$ 20,913	$ 18,959	$ 49,871	$ 20,913
Earnings per share:
Basic (in dollars per share)	$ 0.15	$ 0.11	$ 0.08	$ 0.13	$ 0.14	$ 0.11	$ 0.15	$ 0.91	$ 0.54	$ 0.50	$ 1.29	$ 0.54
Diluted (in dollars per share)	$ 0.15	$ 0.11	$ 0.08	$ 0.13	$ 0.13	$ 0.10	$ 0.15	$ 0.89	$ 0.53	$ 0.49	$ 1.25	$ 0.53