Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details Textuals)	3 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 29, 2015 USD ($) dough_facilities periods bakery-cafes	Dec. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Accounting Policies [Line Items]
Debt Issuance Cost		$ (1,341,000)	$ (216,000)
Fiscal Period Number Of Weeks		364 days	371 days	364 days
Impairment of Long-Lived Assets Held-for-use	$ 3,800,000	$ 3,800,000	$ 900,000	$ 800,000
Deferred Tax Assets, Valuation Allowance		5,299,000	4,625,000
Receivables [Abstract]
Income Taxes Receivable		29,800,000	33,400,000
Other Receivables		29,500,000	24,500,000
Lease Incentive Receivable		11,800,000	7,000,000
Allowance for Doubtful Other Receivables, Current		100,000	100,000
Property, Plant and Equipment, Net [Abstract]
Capitalized Interest Costs, Including Allowance for Funds Used During Construction		200,000	100,000	0
Cost of Property Repairs and Maintenance		67,300,000	62,000,000	56,600,000
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Impairment of Intangible Assets, Finite-lived		0		0
Insurance Loss Reserves [Abstract]
Self Insurance Reserve		37,200,000	32,600,000
Increase (Decrease) in Self Insurance Reserve		54,300,000	50,700,000	46,900,000
Capitalized Development Costs Incurred		9,800,000	10,400,000	9,600,000
Revenue Recognition [Abstract]
Initial Franchise Fees		35,000
Up Front Franchise Fee		5,000
Franchise Fees		4,000,000	3,600,000	2,200,000
Franchise Revenue		134,600,000	120,100,000	110,500,000
Customer Loyalty Program Liability, Current		2,653,000	2,525,000
Revenue Recognition, Gift Cards, Breakage		$ 6,900,000	4,900,000	2,800,000
Loyalty Period, Liability Term		60 days
Advertising Expense		$ 68,500,000	65,500,000	55,600,000
Lease Term Renewal Options Number | periods		1
Bakery-cafe Lease Term (in years)		15 years
FDF Lease Term (in years)		20 years
Bakery Cafe Using Canadian Dollar Functional Currency | bakery-cafes		11
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Percent of Stock paid by Company (as a percent)		15.00%
Vesting Percentage (as a percent)		25.00%
Capitalized Costs, Asset Retirement Costs		$ 10,300,000	13,300,000
Asset Retirement Obligation		19,500,000	19,800,000
Asset Retirement Obligation, Accretion Expense		$ 1,000,000	$ 600,000	$ 600,000
Franchise Dough Facility Using Canadian Functional Currency | dough_facilities		1
Franchise Bakery-cafes Using Canadian Functional Currency | bakery-cafes		6
Minimum [Member]
Revenue Recognition [Abstract]
Lease Term Renewal Options Number | periods		1
Maximum [Member]
Insurance Loss Reserves [Abstract]
Malpractice Insurance, Deductible		$ 800,000
Revenue Recognition [Abstract]
Lease Term Renewal Options Number | periods		2
Lease Agreements [Member] | Minimum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)		4 years
Lease Agreements [Member] | Maximum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)		19 years
Contractual Rights [Member] | Minimum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)		5 years
Contractual Rights [Member] | Maximum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)		20 years
Trademarks [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)		22 years
Franchise Rights [Member] | Maximum [Member]
Revenue Recognition [Abstract]
Franchise Royalty Rate		5.00%
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		15 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		20 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		15 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		2 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		7 years
Computer Software, Intangible Asset [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		3 years
Computer Software, Intangible Asset [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)		5 years
1992 Employee Stock Purchase Plan [Member]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Percent of Stock paid by Employee (as a percent)		85.00%
Tatte Trademark [Member] | Trade Names [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)		8 years