Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 27, 2017		Dec. 28, 2016
Revenue:
Revenue from contract with customer, excluding assessed tax	$ 630,179	$ 529,169	[1]	$ 506,948	[1]
Costs of company restaurant sales:
Product costs	100,532	97,825		90,487
Payroll and benefits	164,314	153,037		142,823
Occupancy	23,228	20,802		19,557
Other operating expenses	60,708	53,049		49,229
Total costs of company restaurant sales	348,782	324,713		302,096
Costs of franchise and license revenue	114,296	39,294		40,805
General and administrative expenses	63,828	66,415		67,960
Depreciation and amortization	27,039	23,720		22,178
Operating (gains), losses and other charges, net	2,620	4,329		26,910
Total operating costs and expenses, net	556,565	458,471		459,949
Operating income	73,614	70,698		46,999
Interest expense, net	20,745	15,640		12,232
Other nonoperating expense (income), net	619	(1,743)		(1,109)
Net income before income taxes	52,250	56,801		35,876
Provision for income taxes	8,557	17,207		16,474
Net income	$ 43,693	$ 39,594		$ 19,402
Basic net income per share	$ 0.69	$ 0.58		$ 0.26
Diluted net income per share	$ 0.67	$ 0.56		$ 0.25
Basic weighted average shares outstanding	63,364	68,077		75,325
Diluted weighted average shares outstanding	65,562	70,403		77,206
Franchisor Owned Outlet [Member]
Revenue:
Revenue from contract with customer, excluding assessed tax	$ 411,932	$ 390,352	[1]	$ 367,310	[1]
Franchise [Member]
Revenue:
Revenue from contract with customer, excluding assessed tax	$ 218,247	$ 138,817		$ 139,638

[1] As disclosed in Note 2, prior period amounts have not been adjusted under the modified retrospective method of adoption of Topic 606.