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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 29, 2014
Dec. 31, 2013
Property and equipment    
Property and equipment, gross, excluding Construction in process $ 61,782coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets $ 57,548coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
Less accumulated depreciation and amortization (34,953)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (32,152)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net, excluding Construction in process 26,829coltdef_PropertyPlantAndEquipmentNetBeforeNonDepreciableItems 25,396coltdef_PropertyPlantAndEquipmentNetBeforeNonDepreciableItems
Construction in process 2,222us-gaap_ConstructionInProgressGross 5,337us-gaap_ConstructionInProgressGross
Property and equipment, net 29,051us-gaap_PropertyPlantAndEquipmentNet 30,733us-gaap_PropertyPlantAndEquipmentNet
Land    
Property and equipment    
Property and equipment, gross, excluding Construction in process 337coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
338coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Building    
Property and equipment    
Property and equipment, gross, excluding Construction in process 2,643coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
2,653coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Estimated Useful Life 33 years  
Machinery and equipment    
Property and equipment    
Fair value of the property and equipment acquired 4,420us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Property and equipment, gross, excluding Construction in process 51,652coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
47,476coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Machinery and equipment | Minimum    
Property and equipment    
Estimated Useful Life 7 years  
Machinery and equipment | Maximum    
Property and equipment    
Estimated Useful Life 10 years  
Furniture, fixtures and leasehold improvements    
Property and equipment    
Fair value of the property and equipment acquired 30us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= coltdef_FurnitureFixturesAndLeaseholdImprovementsMember
 
Property and equipment, gross, excluding Construction in process 7,150coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= coltdef_FurnitureFixturesAndLeaseholdImprovementsMember
7,081coltdef_PropertyPlantAndEquipmentGrossExcludingNondepreciableAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= coltdef_FurnitureFixturesAndLeaseholdImprovementsMember
Furniture, fixtures and leasehold improvements | Minimum    
Property and equipment    
Estimated Useful Life 3 years  
Furniture, fixtures and leasehold improvements | Maximum    
Property and equipment    
Estimated Useful Life 5 years  
Construction in process    
Property and equipment    
Fair value of the property and equipment acquired $ 732us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember