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Closed Restaurant Reserve (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 30, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Closed restaurant reserves, beginning of period	$ 583us-gaap_RestructuringReserve	$ 788us-gaap_RestructuringReserve
Additions—store closing costs recognized, accretion	77us-gaap_RestructuringCharges	80us-gaap_RestructuringCharges
Decreases—payments	(216)us-gaap_PaymentsForRestructuring	(285)us-gaap_PaymentsForRestructuring
Closed restaurant reserves, end of period	$ 444us-gaap_RestructuringReserve	$ 583us-gaap_RestructuringReserve

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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