Earnings per Share - Schedule of Basic and Diluted Net Income per Share Data (Detail) - 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
Numerator:
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
Denominator:
Weighted-average shares outstanding - basic (in shares)									38,725,541	38,106,057	38,689,508	38,725,541
Weighted-average shares outstanding - diluted (in shares)									39,274,649	38,683,959	39,949,907	39,274,649
Net (loss) income 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
Net (loss) income per share - 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
Antidilutive options, unvested restricted stock awards, unvested RSUs and warrants excluded from the computations (in shares)									8,343,842	686,278	69,722
Dilutive effect of restricted shares
Denominator:
Dilutive effect (in shares)									263,003	256,217	417,371
Dilutive effect of stock options
Denominator:
Dilutive effect (in shares)									0	17,611	28,931
Dilutive effect of warrants
Denominator:
Dilutive effect (in shares)									286,105	304,074	814,097