Basis of Presentation and Summary of Significant Accounting Policies - Adjustments for Topic 842 (Details) - USD ($) $ in Thousands	Sep. 10, 2019	Jun. 18, 2019	Mar. 26, 2019	Jan. 02, 2019	Jan. 01, 2019	Sep. 11, 2018	Jun. 19, 2018	Mar. 27, 2018	Jan. 02, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	$ 8,568			$ 7,153	$ 7,153	$ 6,628			$ 6,559
Accounts and other receivables, net	2,980			3,167	3,167
Inventories	2,877			2,932	2,932
Prepaid expenses and other current assets	3,457			2,371	4,935
Assets held for sale	14,260			14,794	14,794
Total current assets	32,142			30,417	32,981
Property and equipment, net	148,903			147,590	161,429
Operating lease right-of-use assets	232,935			218,855	0
Goodwill	310,989			321,531	321,531
Trademarks	220,300			220,300	220,300
Intangible assets, net	11,049			10,931	18,507
Other assets, net	3,918			4,208	4,208
Total assets	960,236			953,832	758,956
Accounts payable	20,749			19,877	19,877
Other accrued liabilities	38,286			34,360	34,785
Current portion of finance lease obligations, other debt and deemed landlord financing liabilities	363			486	1,033
Current portion of operating lease liabilities	18,800			17,303	0
Total current liabilities	78,198			72,026	55,695
Long-term debt, finance lease obligations, other debt and deemed landlord financing liabilities, excluding current portion, net	150,601			159,624	178,664
Operating lease liabilities, excluding current portion	231,002			213,313	0
Deferred income taxes	71,290			70,179	69,471
Other non-current liabilities	14,631			14,504	32,852
Total liabilities	545,722			529,646	336,682
Commitments and contingencies
Preferred stock, $0.0001 par value; 1,000,000 shares authorized; no shares issued and outstanding	0			0	0
Common stock, $0.0001 par value; 400,000,000 shares authorized; 37,059,202 shares issued and outstanding at September 10, 2019; 37,305,342 shares issued and outstanding at January 1, 2019	4			4	4
Additional paid-in capital	331,687			336,941	336,941
Accumulated other comprehensive (loss) income	(86)			180	180
Retained earnings	82,909			87,061	85,149
Total shareholders’ equity	414,514	$ 423,308	$ 422,696	424,186	422,274	$ 423,276	$ 421,172	$ 420,160	$ 416,249
Total liabilities and shareholders’ equity	$ 960,236			953,832	$ 758,956
Topic 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents				0
Accounts and other receivables, net				0
Inventories				0
Prepaid expenses and other current assets				(2,564)
Assets held for sale				0
Total current assets				(2,564)
Property and equipment, net				(13,839)
Operating lease right-of-use assets				218,855
Goodwill				0
Trademarks				0
Intangible assets, net				(7,576)
Other assets, net				0
Total assets				194,876
Accounts payable				0
Other accrued liabilities				(425)
Current portion of finance lease obligations, other debt and deemed landlord financing liabilities				(547)
Current portion of operating lease liabilities				17,303
Total current liabilities				16,331
Long-term debt, finance lease obligations, other debt and deemed landlord financing liabilities, excluding current portion, net				(19,040)
Operating lease liabilities, excluding current portion				213,313
Deferred income taxes				708
Other non-current liabilities				(18,348)
Total liabilities				192,964
Commitments and contingencies
Preferred stock, $0.0001 par value; 1,000,000 shares authorized; no shares issued and outstanding				0
Common stock, $0.0001 par value; 400,000,000 shares authorized; 37,059,202 shares issued and outstanding at September 10, 2019; 37,305,342 shares issued and outstanding at January 1, 2019				0
Additional paid-in capital				0
Accumulated other comprehensive (loss) income				0
Retained earnings				1,912
Total shareholders’ equity				1,912
Total liabilities and shareholders’ equity				$ 194,876