Acquisition (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended				43 Months Ended
	Jul. 01, 2012	Jul. 01, 2012	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	Jan. 03, 2016	May 30, 2012
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net								$ 74,712,000
Business Acquisition, Cost of Acquired Entity, Purchase Price								74,712,000
Business Acquisition, Period Results Included in Combined Entity		27470
Business Combination, Acquisition Related Costs	800,000	1,200,000
Business Acquisition, Cost of Acquired Entity, Cash Paid								12,135,000
Sale of Stock, Percentage of Ownership after Transaction		28.90%
Number of Restaurants	574	574
Number of States for Right of First Refusal								20
Restaurants to be remodeled			90	154	154	57	455
LeasedRestaurants [Member]
Business Acquisition [Line Items]
Number of Restaurants								81
Restaurants on sub-lease [Member]
Business Acquisition [Line Items]
Number of Restaurants								197
Cash paid for cash and inventory [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid								3,800,000
Business Acquisition, Cost of Acquired Entity, Purchase Price, Cost of Inventory [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price								417,000
Business Acquisition, Cost of Acquired Entity, Cash Paid								3,336,000
Other cash payments [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price								3,805,000
Other cash payments paid at closing [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price								9,443,000
Business Acquisition, Cost of Acquired Entity, Cash Paid								190,000
Other cash payments not paid at closing [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price								4,449,000
Additional Paid-in Capital [Member] | Business Acquisition, Cost of Acquired Entity, Purchase Price, Equity Consideration [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price								$ 57,711,000
Acquired restaurants [Member]
Business Acquisition [Line Items]
Number of Restaurants								278