Stock-Based Compensation - Additional Information (Detail) - USD ($)		4 Months Ended	12 Months Ended
	Mar. 20, 2015	Jan. 01, 2019	Jan. 01, 2019	Jan. 02, 2018	Jan. 03, 2017	Mar. 20, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value			$ 13.88
Additional shares granted during period (in shares)			594,619
Granted (in shares)		106,000	106,000
Unrecognized compensation expense, net		$ 800,000	$ 800,000
Tax withholdings on restricted stock vesting			168,484	140,209
Number of awards outstanding		1,234,531	1,234,531	1,088,910
Number of stock options outstanding		453,250	453,250	417,000
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved and authorized for issuance		3,300,000	3,300,000
Common stock authorized and available for grant		900,976	900,976
Stock-based compensation expense recorded			$ 6,100,000	$ 4,900,000	$ 4,100,000
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition			2 years 5 months 19 days
Weighted-average grant date fair value			$ 13.88	$ 13.64	$ 9.30
Total fair value of awards vested			$ 5,900,000	$ 5,400,000	$ 2,400,000.0
Unrecognized compensation expense, net		$ 10,300,000	10,300,000
Payments related to employee tax withholding obligations			$ 2,400,000	1,900,000
Restricted Shares | 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Additional shares granted during period (in shares)			594,619
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition			2 years 4 months 24 days
Vesting period			4 years
Total intrinsic value of stock options exercised			$ 51,000	0	0
Successor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recorded	$ 500,000
Payments related to employee tax withholding obligations			$ 2,378,000	$ 1,923,000	$ 916,000
Predecessor | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards outstanding						0