Restatement of 2018 Consolidated Financial Statements - Impact of Corrections on Condensed Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Revenues:
Total revenues	$ 417,514	$ 403,706	$ 399,623	$ 398,405	$ 397,566	$ 385,231	$ 429,952	$ 450,122	$ 1,619,248	$ 1,662,871	$ 1,783,359
Costs and expenses:
General and administrative expenses									223,460	193,534	150,866
Total costs and expenses									1,599,452	1,631,029	1,630,668
Operating income	(132)	4,927	14,231	5,509	(7,326)	(14,170)	24,910	28,139	24,535	31,553	151,017
Interest expense									(20,593)	(25,673)	(11,283)
Income before income taxes									5,046	6,697	140,342
Income tax expense									(611)	2,624	33,817
Net income before attribution to noncontrolling interests									5,657	4,073	106,525
Net income attributable to the Company	$ (2,142)	$ 385	$ 8,354	$ (1,731)	$ (12,868)	$ (13,300)	$ 11,199	$ 17,443	4,866	2,474	102,292
Net income attributable to common shareholders									$ (7,633)	$ 2,474	$ 103,288
Basic earnings per common share	$ (0.18)	$ (0.10)	$ 0.15	$ (0.12)	$ (0.41)	$ (0.42)	$ 0.35	$ 0.52	$ (0.24)	$ 0.08	$ 2.86
Diluted earnings per common share	$ (0.18)	$ (0.10)	$ 0.15	$ (0.12)	$ (0.41)	$ (0.42)	$ 0.35	$ 0.52	$ (0.24)	$ 0.08	$ 2.83
Domestic Company-owned restaurants
Revenues:
Total revenues									$ 652,053	$ 692,380	$ 816,718
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):									526,237	577,658	664,640
Other segment
Revenues:
Total revenues									179,791	170,983	72,179
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):									$ 175,592	170,556	$ 69,335
As reported
Revenues:
Total revenues										1,573,316
Costs and expenses:
General and administrative expenses										192,551
Total costs and expenses										1,542,647
Operating income										30,380
Interest expense										(25,306)
Income before income taxes										5,891
Income tax expense										2,646
Net income before attribution to noncontrolling interests										3,245
Net income attributable to the Company										1,646
Net income attributable to common shareholders										$ 1,646
Basic earnings per common share										$ 0.05
Diluted earnings per common share										$ 0.05
As reported | Domestic Company-owned restaurants
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):										$ 576,799
As reported | Other segment
Revenues:
Total revenues										81,428
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):										84,016
Total Adjustments
Revenues:
Total revenues										89,555
Costs and expenses:
General and administrative expenses										983
Total costs and expenses										88,382
Operating income										1,173
Interest expense										(367)
Income before income taxes										806
Income tax expense										(22)
Net income before attribution to noncontrolling interests										828
Net income attributable to the Company										828
Net income attributable to common shareholders										$ 828
Basic earnings per common share										$ 0.03
Diluted earnings per common share										$ 0.03
Total Adjustments | Domestic Company-owned restaurants
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):										$ 859
Total Adjustments | Other segment
Revenues:
Total revenues										89,555
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):										$ 86,540