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NOTE 5 - DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 28, 2013
Dec. 27, 2014
Aug. 30, 2013
Jan. 01, 2013
NOTE 5 - DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS (Details) [Line Items]        
Provision for Doubtful Accounts (in Dollars) $ 0.7us-gaap_ProvisionForDoubtfulAccounts      
Notes Receivable [Member] | Aspen [Member]        
NOTE 5 - DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS (Details) [Line Items]        
Note Receivable, Maturity Date, Description   September 2011    
Note Receivable, Interest Rate   6.00%eng_NoteReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_AspenMember
   
Notes Receivable [Member] | Steele & Company, LP [Member]        
NOTE 5 - DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS (Details) [Line Items]        
Note Receivable, Interest Rate   8.00%eng_NoteReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_SteeleCompanyLPMember
   
Receivable, Term of Note Receivable   4 years    
Notes Receivable [Member] | Furmanite Corporation [Member]        
NOTE 5 - DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS (Details) [Line Items]        
Note Receivable, Maturity Date, Description     September 1, 2017 January 2, 2017
Note Receivable, Interest Rate     4.00%eng_NoteReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_FurmaniteCorporationMember
5.00%eng_NoteReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_FurmaniteCorporationMember
Receivable, Term of Note Receivable       4 years