Leases - Additional Information (Details) $ in Thousands	4 Months Ended	6 Months Ended	12 Months Ended
	Jan. 03, 2017 location	Dec. 29, 2015 USD ($)	Jan. 01, 2019 USD ($) property location	Jan. 02, 2018 USD ($)
Operating Leased Assets [Line Items]
Number of properties subleased | property			26
Number of Underperforming Restaurant Locations, Terminated | location			1
Net proceeds from sale-leaseback arrangements			$ 9,900	$ 3,400
Lease agreement term (in years)			35 years
Sale Leaseback Transaction, Deferred Gain, Net			$ 300
Successor
Operating Leased Assets [Line Items]
Deferred rent liability			16,600	17,400
Unfavorable lease liabilities, net			11,975	14,469
Unfavorable leases, accumulated amortization			7,200	6,100
Sublease rent income		$ 2,343	3,115	2,844
Sublease contingent rental income			100	$ 100
Total sublease amounts receivable			$ 28,900
Number of Underperforming Restaurant Locations, Subleased | location			11
Number of underperforming locations | location	12
Costa Mesa [Member]
Operating Leased Assets [Line Items]
Lease agreement term (in years)				20 years
Las Vegas [Member]
Operating Leased Assets [Line Items]
Lease agreement term (in years)				20 years
Sale of Land and Building in Victorville
Operating Leased Assets [Line Items]
Lease agreement term (in years)	1 year
Lessee Leasing Arrangements, Operating Leases, Termination Notice				60 days
Sale of Land and Building in Bakersfield
Operating Leased Assets [Line Items]
Lease agreement term (in years)	20 years
Capital Lease Obligations | Successor
Operating Leased Assets [Line Items]
Interest rate on capital lease			10.00%
Occupancy and Other - Franchise Subleases | Successor
Operating Leased Assets [Line Items]
Sublease rent income		$ 2,207	$ 2,855	$ 2,608
Property Lease Guarantee
Operating Leased Assets [Line Items]
Lease agreement term (in years)			13 years
Guarantor obligations, maximum exposure, lease payments			$ 1,800