Long-Term Debt	9 Months Ended
Long-Term Debt	Sep. 27, 2016
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The Company has a credit facility with a borrowing capacity on the revolving line of credit of $100.0 million, expiring in June 2020. As of September 27, 2016, the Company had $84.5 million of indebtedness and $2.7 million letters of credit outstanding under the revolving line of credit. The Company’s ability to borrow funds pursuant to the revolving line of credit is further limited by the requirement that it comply with the revolving line of credit’s financial covenants upon the measurement dates specified therein. These financial covenants include a maximum lease-adjusted leverage ratio and a minimum consolidated fixed charge coverage ratio. The credit agreement also contains other customary covenants, including limitations on additional borrowings, acquisitions, dividend payments and lease commitments. The credit facility bore interest between 2.59% and 5.50% during the first three quarters of 2016. On August 2, 2016, the Company entered into an amendment to its credit facility to revise the financial covenant levels and related definitions and make certain other changes, including an increase in the interest rate and commitment fee. All other material terms remained the same. The Company also maintains outstanding letters of credit to secure obligations under its workers’ compensation program and certain lease obligations. The Company was in compliance with all of its debt covenants as of September 27, 2016. On November 4, 2016, the Company entered into an amendment to its credit facility to (i) remove the ability to increase the maximum commitment amount under the credit facility, (ii) require quarterly amortization payments of $2.5 million, with corresponding reductions of commitments, beginning in the third fiscal quarter of 2017, (iii) revise the financial covenant levels and related financial definitions (as described below), (iv) reduce certain of the baskets for permitted indebtedness, (v) add restrictions with respect to capital expenditures and the entry into new leases (as described below), (vi) increase the interest rate margin and commitment fees and (vii) make certain other changes. The Consolidated EBITDA definition in the amended credit facility will permit up to $1.5 million of one-time costs associated with the termination of leases associated with the Company’s reduction in development and up to $2.7 million of pro forma general and administrative cash cost savings resulting from the headcount reduction completed prior to the end of the third fiscal quarter of 2016 to be added back into the EBITDA calculation. The credit facility amendment will increase the maximum lease-adjusted leverage ratio to 5.50x, and it provides for such ratio to step down to 5.25x in the second fiscal quarter of 2017, 5.00x in the fourth fiscal quarter of 2017 and 4.75x in the second fiscal quarter of 2018. The amendment also reduces the minimum fixed charge coverage level from 1.50x to 1.15x (stepping up to 1.25x in the third fiscal quarter of 2017). Growth capital expenditures (such as expenditures for new restaurants and acquisitions) will be limited under the amended credit facility to $4.0 million in the fourth fiscal quarter of 2016 and to $10.0 million in each fiscal year thereafter, and there will be a test of availability under the line of credit for any borrowings the proceeds of which are to be used for such growth capital expenditures. The amended credit facility also contains a new negative covenant that requires the Company to be in compliance with a 5.00x lease-adjusted leverage ratio or have liquidity of at least $10.0 million to enter into leases for new restaurants. Certain of the revisions to the financial covenants and financial covenant definitions in the credit facility amendment provide the Company with more flexibility; however, certain other terms of the amended credit facility, and specifically the added restrictions with respect to capital expenditures and the entry into new leases, may restrict the Company’s activities, particularly development of new restaurants.