Basis of Presentation and Summary of Significant Accounting Policies - Impact of Adoption of Topic 606 - Consolidated Statements of Cash Flows (Details) - Successor - USD ($) $ 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
Operating activities
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
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for doubtful accounts										45	0	0
Depreciation and amortization										25,794	23,362	23,129
Amortization of favorable and unfavorable lease assets and liabilities, net									$ (607)	(767)	(809)	(607)
Amortization of deferred financing costs and interest rate cap										445	389	392
Stock-based compensation										6,079	4,876	4,096
Impairment of long-lived assets										3,861	0	0
Deferred income taxes										1,097	(22,594)	10,741
Loss on disposal of assets, net										1,012	1,075	312
Restaurant closure charges, net										(449)	(379)	(179)
Other Noncash Income										(523)	0	0
Changes in operating assets and liabilities:
Accounts and other receivables, net										616	313	(921)
Inventories										(220)	6	88
Prepaid expenses and other current assets										1,949	(2,580)	(659)
Other assets										(125)	(162)	(59)
Accounts payable										2	2,332	(404)
Other accrued liabilities										(488)	(1,526)	3,733
Other non-current liabilities										3,647	2,856	(3,387)
Net cash provided by operating activities										61,832	$ 57,788	$ 57,546
Amounts Under Previous Standards
Operating activities
Net income										19,251
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for doubtful accounts										45
Depreciation and amortization										25,794
Amortization of favorable and unfavorable lease assets and liabilities, net										(767)
Amortization of deferred financing costs and interest rate cap										445
Stock-based compensation										6,079
Impairment of long-lived assets										3,861
Deferred income taxes										1,205
Loss on disposal of assets, net										1,012
Restaurant closure charges, net										(449)
Changes in operating assets and liabilities:
Accounts and other receivables, net										616
Inventories										(220)
Prepaid expenses and other current assets										1,949
Other assets										(125)
Accounts payable										2
Other accrued liabilities										(488)
Other non-current liabilities										3,247
Net cash provided by operating activities										61,832
Accounting Standards Update 2014-09 | Adjustments for Prior Revenue Recognition Standards
Operating activities
Net income										292
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for doubtful accounts										0
Depreciation and amortization										0
Amortization of favorable and unfavorable lease assets and liabilities, net										0
Amortization of deferred financing costs and interest rate cap										0
Stock-based compensation										0
Impairment of long-lived assets										0
Deferred income taxes										108
Loss on disposal of assets, net										0
Restaurant closure charges, net										0
Other Noncash Income										0
Changes in operating assets and liabilities:
Accounts and other receivables, net										0
Inventories										0
Prepaid expenses and other current assets										0
Other assets										0
Accounts payable										0
Other accrued liabilities										0
Other non-current liabilities										(400)
Net cash provided by operating activities										$ 0