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Concentration of risk (Details)
 0 Months Ended 6 Months Ended 12 Months Ended
Mar. 30, 2014
item
Jun. 29, 2014
Dec. 31, 2013
Agreement with UAW Local 376 | Colt's Manufacturing Company LLC      
Concentration of risks      
Term of contract 5 years    
Number of employee covered 529coltdef_NumberOfEmployeeCoveredUnderAgreement
/ us-gaap_CollectiveBargainingArrangementAxis
= coltdef_AgreementWithUAWLocal376Member
/ dei_LegalEntityAxis
= coltdef_ColtsManufacturingCompanyLLCMember		    
Labor concentration risk | Agreement with UAW Local 376 | Colt's Manufacturing Company LLC      
Concentration of risks      
Term of contract 5 years    
Number of employee covered 529coltdef_NumberOfEmployeeCoveredUnderAgreement
/ us-gaap_CollectiveBargainingArrangementAxis
= coltdef_AgreementWithUAWLocal376Member
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_UnionizedEmployeesConcentrationRiskMember
/ dei_LegalEntityAxis
= coltdef_ColtsManufacturingCompanyLLCMember		    
Accounts receivable | Concentration of credit risk      
Concentration of risks      
Number of largest individual trade receivable balances   2coltdef_NumberOfCustomersWithAccountsReceivableBalancesExceedingDisclosureThreshold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember		 2coltdef_NumberOfCustomersWithAccountsReceivableBalancesExceedingDisclosureThreshold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
Accounts receivable | Concentration of credit risk | Customer with largest individual trade balance      
Concentration of risks      
Concentration risk, percentage   23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= coltdef_CustomerWithLargestReceivableBalanceMember		 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= coltdef_CustomerWithLargestReceivableBalanceMember
Accounts receivable | Concentration of credit risk | Customer with second largest individual trade balance      
Concentration of risks      
Concentration risk, percentage   19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= coltdef_CustomerWithSecondLargestReceivableBalanceMember		 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= coltdef_CustomerWithSecondLargestReceivableBalanceMember
U.S. workforce | Labor concentration risk      
Concentration of risks      
Concentration risk, percentage   72.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_NumberOfEmployeesGeographicAreaMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_UnionizedEmployeesConcentrationRiskMember