General (Details) $ in Millions	Sep. 24, 2016 store state	Dec. 26, 2015 USD ($)	Sep. 26, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred Tax Assets, Net \| $		$ 46.0	$ 42.6
Number of stores \| store	1,575
Number of states in which entity operates \| state	49

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

Name:	us-gaap_DeferredTaxAssetsLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant