2.4.0.84010 - Disclosure - Summary of significant accounting policies (Details)truefalsefalse1false falsefalseI2013Q2http://www.sec.gov/CIK0001048620instant2013-07-02T00:00:000001-01-01T00:00:00RestaurantStandardhttp://www.gcfb.net/20130702restaurantgcfb0ItemStandardhttp://www.gcfb.net/20130702itemgcfb01true 1us-gaap_AccountingPoliciesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Summary of significant accounting policies2false 2gcfb_NumberOfCasualDiningConceptsWhichEntityDevelopsAndOperatesgcfb_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse22falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of casual dining concepts developed and operated by the entity.No definition available.false256Number of casual dining concepts3false 2us-gaap_NumberOfRestaurantsus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2929falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of restaurants.No definition available.false256Number of restaurants operated by the entity4false 2gcfb_NumberOfRestaurantsExpectedToBeOpenedInCurrentFiscalYeargcfb_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of restaurants the entity plans to open later in the current fiscal year.No definition available.false256Number of additional Granite City restaurants the Company plans to open later this year5false 2gcfb_NumberOfSpecifiedRestaurantsWhichEntityOperatesgcfb_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse66falsefalsefalsexbrli:integerItemTypeintegerRepresents the number of specified restaurants featuring freshly prepared, authentic, All-American cuisine in a fun, dynamic environment, which are operated by the entity.No definition available.false256Number of Cadillac Ranch restaurants operated by the entityfalseSummary of significant accounting policies (Details)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.gcfb.net/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails15