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Nature of Operations and Summary of Significant Accounting Policies (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]      
Income from non-marketable equity investments accounted for on the equity method $ 3,923us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 2,934us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 2,998us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Royalty income from patents 0us-gaap_RoyaltyIncomeNonoperating 0us-gaap_RoyaltyIncomeNonoperating 30us-gaap_RoyaltyIncomeNonoperating
Proceeds from insurance for involuntary conversion 603esca_GainLossFromInsuranceProceedsForInvoluntaryConversion 0esca_GainLossFromInsuranceProceedsForInvoluntaryConversion 0esca_GainLossFromInsuranceProceedsForInvoluntaryConversion
Rent income from real estate 106us-gaap_ProfitLossFromRealEstateOperations 0us-gaap_ProfitLossFromRealEstateOperations 0us-gaap_ProfitLossFromRealEstateOperations
Other 94us-gaap_NoninterestIncomeOther 0us-gaap_NoninterestIncomeOther 0us-gaap_NoninterestIncomeOther
Other Income $ 4,726us-gaap_OtherIncome $ 2,934us-gaap_OtherIncome $ 3,028us-gaap_OtherIncome