Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details Textuals)	3 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 27, 2016 USD ($) dough_facilities periods bakery-cafes	Dec. 29, 2015 USD ($)	Dec. 30, 2014 USD ($)
Accounting Policies [Line Items]
Deferred Tax Assets, Net of Valuation Allowance, Current			$ 34,500,000
Debt Issuance Cost		$ 1,035,000	$ 1,341,000
Fiscal Period Number Of Weeks		364 days	364 days	364 days
Impairment of Long-Lived Assets Held-for-use	$ 3,800,000	$ 4,000,000	$ 3,800,000	$ 900,000
Impairment of Intangible Assets, Finite-lived		300,000	300,000.0	0
Deferred Tax Assets, Valuation Allowance		11,326,000	5,299,000
Receivables [Abstract]
Income Taxes Receivable		9,800,000	29,800,000
Other Receivables		30,900,000	29,500,000
Lease Incentive Receivable		6,100,000	11,800,000
Allowance for Doubtful Other Receivables, Current		200,000	100,000
Property, Plant and Equipment, Net [Abstract]
Capitalized Interest Costs, Including Allowance for Funds Used During Construction		300,000	200,000	100,000
Cost of Property Repairs and Maintenance		72,700,000	67,300,000	62,000,000
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Goodwill, Impairment Loss		0	0	2,100,000
Insurance Loss Reserves [Abstract]
Self Insurance Reserve		41,700,000	37,200,000
Increase (Decrease) in Self Insurance Reserve		49,200,000	54,300,000	50,700,000
Capitalized Development Costs Incurred		9,900,000	9,800,000	10,400,000
Revenue Recognition [Abstract]
Initial Franchise Fees		35,000
Up Front Franchise Fee		5,000
Franchise Fees		2,200,000	4,000,000	3,600,000
Franchise Revenue		153,100,000	134,600,000	120,100,000
Customer Loyalty Program Liability, Current		3,239,000	2,653,000
Revenue Recognition, Gift Cards, Breakage		$ 11,200,000	6,900,000	4,900,000
Loyalty Period, Liability Term		60 days
Advertising Expense		$ 71,600,000	68,500,000	65,500,000
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		1
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		$ 8,900,000	10,300,000
Asset Retirement Obligation		20,400,000	19,500,000
Asset Retirement Obligation, Accretion Expense		$ 800,000	$ 1,000,000	600,000
Franchise Dough Facility Using Canadian Functional Currency | dough_facilities		1
Franchise Bakery-cafes Using Canadian Functional Currency | bakery-cafes		18
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)		7 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%
Company Bakery Cafe Operations [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Goodwill, Impairment Loss				$ 2,057,000
Tatte Trademark [Member] | Trade Names [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Useful Life, Minimum (in years)		8 years
Refranchising Loss [Member]
Accounting Policies [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 1,100,000
Other Operating Income (Expense) [Member]
Accounting Policies [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 2,900,000