Income Taxes - Schedule of Effective Rates and the Statutory Federal Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	4 Months Ended	6 Months Ended	12 Months Ended
Jan. 01, 2019	Dec. 29, 2015	Jan. 01, 2019	Jan. 02, 2018	Jan. 03, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax reform			$ (29,100)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income taxes (percent)			21.00%	35.00%
Successor
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income taxes			$ 5,380	$ 11,916	$ 12,685
State and local income taxes, net of federal tax benefit			1,639	1,688	1,882
Targeted job credits			(727)	(420)	(448)
Investment in subsidiary			0	0	570
Tax reform	$ (300)		(291)	(29,111)	0
Transaction costs			0	0	227
Executive compensation disallowed			362	81	104
Permanent tax differences and other			296	22	309
Income tax provision (benefit)		$ 15,329	$ 6,659	$ (15,824)	$ 15,329
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income taxes (percent)			21.00%	35.00%	35.00%
State and local income taxes, net of federal tax benefit (percent)			6.40%	5.00%	5.20%
Targeted job credits (percent)			(2.80%)	(1.20%)	(1.20%)
Investment in subsidiary (percent)			0.00%	0.00%	1.60%
Tax reform			(1.10%)	(85.50%)	0.00%
Transaction costs (percent)			0.00%	0.00%	0.60%
Executive compensation disallowed			1.40%	0.20%	0.30%
Permanent tax differences and other (percent)			1.10%	0.00%	0.80%
Effective income tax rates (percent)		42.30%	26.00%	(46.50%)	42.30%

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