Consolidating Guarantor Financial Information - Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 25, 2014	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Cash flows provided by (used in) operating activities:
Cash flows provided by (used in) operating activities:		$ 104,453	$ 118,687	$ 100,613
Cash flows provided by (used in) investing activities:
Payments to Acquire Businesses, Gross		0	0	663
Acquisition of Franchise				(663)
Intercompany note				0
Development of internal use software		(3,243)	(10,455)	(4,802)
Proceeds from sale of property and equipment		489	696	308
Net cash used in investing activities		(93,712)	(98,439)	(78,191)
Net repayments on revolving credit facility				(49)
Cash flows from financing activities:
Repayments on senior term loan		(7,600)	(7,600)	(9,500)
Repayments of Notes Payable		(13)	(50)	(49)
Intercompany Note			0	0
Proceeds from sale leaseback transaction	$ 183,700	4,073	0	0
Payments on capital lease obligations		(467)	(421)	(405)
Payments on sale leaseback obligations		(2,470)	(2,028)	(1,663)
Dividends paid		0	0	(70,000)
Excess tax benefit realized from stock-based compensation		0	4	18
Equity contribution		1,447	0	0
Net cash used in financing activities		(5,030)	(10,095)	(81,599)
Effect of foreign exchange rate changes on cash		466	216	(1,163)
Change in cash and cash equivalents		6,177	10,369	(60,340)
Cash and cash equivalents at beginning of period		61,023	50,654	110,994
Cash and cash equivalents at end of period		67,200	61,023	50,654
Payments to Acquire Property, Plant, and Equipment		(90,958)	(88,680)	(73,034)
Cash Equivalents, at Carrying Value			61,023	50,654	$ 110,994
Reportable Legal Entities [Member] | Parent Company [Member]
Cash flows provided by (used in) operating activities:
Cash flows provided by (used in) operating activities:		73,925	73,722	95,659
Cash flows provided by (used in) investing activities:
Acquisition of Franchise				(663)
Intercompany note				2,393
Development of internal use software		0	(7,671)	(2,018)
Proceeds from sale of property and equipment		489	696	308
Net cash used in investing activities		(62,055)	(76,802)	(65,050)
Net repayments on revolving credit facility				0
Cash flows from financing activities:
Repayments on senior term loan		(7,600)	(7,600)	(9,500)
Repayments of Notes Payable		0	0
Intercompany Note			23,974	(3,847)
Proceeds from sale leaseback transaction		4,073
Payments on capital lease obligations		(460)	(417)	(402)
Payments on sale leaseback obligations		(2,470)	(2,028)	(1,663)
Dividends paid				(70,000)
Excess tax benefit realized from stock-based compensation			4	18
Equity contribution		1,447
Net cash used in financing activities		(5,010)	13,933	(85,394)
Effect of foreign exchange rate changes on cash		0	0	0
Change in cash and cash equivalents		6,860	10,853	(54,785)
Cash and cash equivalents at beginning of period		53,088	42,235
Cash and cash equivalents at end of period		59,948	53,088	42,235
Payments to Acquire Property, Plant, and Equipment		(62,544)	(69,827)	(65,070)
Cash Equivalents, at Carrying Value				42,235	97,020
Reportable Legal Entities [Member] | Guarantor [Member]
Cash flows provided by (used in) operating activities:
Cash flows provided by (used in) operating activities:		29,569	44,608	(492)
Cash flows provided by (used in) investing activities:
Acquisition of Franchise				0
Intercompany note				2,925
Development of internal use software		(3,243)	(2,784)	(2,784)
Proceeds from sale of property and equipment		0	0	0
Net cash used in investing activities		(30,304)	(21,223)	(5,887)
Net repayments on revolving credit facility				(49)
Cash flows from financing activities:
Repayments on senior term loan		0	0	0
Repayments of Notes Payable		(13)	(50)
Intercompany Note			(23,974)	1,798
Proceeds from sale leaseback transaction		0
Payments on capital lease obligations		0	0	0
Payments on sale leaseback obligations		0	0	0
Dividends paid				0
Excess tax benefit realized from stock-based compensation			0	0
Equity contribution		0
Net cash used in financing activities		(13)	(24,024)	1,749
Effect of foreign exchange rate changes on cash		0	0	0
Change in cash and cash equivalents		(748)	(639)	(4,630)
Cash and cash equivalents at beginning of period		1,158	1,797
Cash and cash equivalents at end of period		410	1,158	1,797
Payments to Acquire Property, Plant, and Equipment		(27,061)	(18,439)	(6,028)
Cash Equivalents, at Carrying Value				1,797	6,427
Reportable Legal Entities [Member] | Non-Guarantors [Member]
Cash flows provided by (used in) operating activities:
Cash flows provided by (used in) operating activities:		959	357	5,446
Cash flows provided by (used in) investing activities:
Acquisition of Franchise				0
Intercompany note				0
Development of internal use software		0	0	0
Proceeds from sale of property and equipment		0	0	0
Net cash used in investing activities		(1,353)	(414)	(1,936)
Net repayments on revolving credit facility				0
Cash flows from financing activities:
Repayments on senior term loan		0	0	0
Repayments of Notes Payable		0	0
Intercompany Note			0	(3,269)
Proceeds from sale leaseback transaction		0
Payments on capital lease obligations		(7)	(4)	(3)
Payments on sale leaseback obligations		0	0	0
Dividends paid				0
Excess tax benefit realized from stock-based compensation			0	0
Equity contribution		0
Net cash used in financing activities		(7)	(4)	(3,272)
Effect of foreign exchange rate changes on cash		466	216	(1,163)
Change in cash and cash equivalents		65	155	(925)
Cash and cash equivalents at beginning of period		6,777	6,622
Cash and cash equivalents at end of period		6,842	6,777	6,622
Payments to Acquire Property, Plant, and Equipment		(1,353)	(414)	(1,936)
Cash Equivalents, at Carrying Value				6,622	7,547
Eliminations [Member]
Cash flows provided by (used in) operating activities:
Cash flows provided by (used in) operating activities:		0	0	0
Cash flows provided by (used in) investing activities:
Acquisition of Franchise				0
Intercompany note				(5,318)
Development of internal use software		0	0	0
Proceeds from sale of property and equipment		0	0	0
Net cash used in investing activities		0	0	(5,318)
Net repayments on revolving credit facility				0
Cash flows from financing activities:
Repayments on senior term loan		0	0	0
Repayments of Notes Payable		0	0
Intercompany Note			0	5,318
Proceeds from sale leaseback transaction		0
Payments on capital lease obligations		0	0	0
Payments on sale leaseback obligations		0	0	0
Dividends paid				0
Excess tax benefit realized from stock-based compensation			0	0
Equity contribution		0
Net cash used in financing activities		0	0	5,318
Effect of foreign exchange rate changes on cash		0	0	0
Change in cash and cash equivalents		0	0	0
Cash and cash equivalents at beginning of period		0
Cash and cash equivalents at end of period		0	0
Payments to Acquire Property, Plant, and Equipment		$ 0	0	0
Cash Equivalents, at Carrying Value			$ 0	$ 0	$ 0