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Business Segment Information - Summary of financial information concerning reportable segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers $ 817,797us-gaap_Revenues $ 900,393us-gaap_Revenues $ 2,447,946us-gaap_Revenues $ 2,658,844us-gaap_Revenues
Net income attributable to CACI 29,039us-gaap_NetIncomeLoss 30,828us-gaap_NetIncomeLoss 84,811us-gaap_NetIncomeLoss 98,782us-gaap_NetIncomeLoss
Reportable Geographical Components | Domestic        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 781,618us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
863,531us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
2,340,501us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
2,551,863us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
Net income attributable to CACI 26,237us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
28,002us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
76,454us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
90,916us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_DomesticOperationsMember
Reportable Geographical Components | International        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from external customers 36,179us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember
36,862us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember
107,445us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember
106,981us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember
Net income attributable to CACI $ 2,802us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember
$ 2,826us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember
$ 8,357us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember
$ 7,866us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableGeographicalComponentsMember
/ us-gaap_StatementGeographicalAxis
= caci_InternationalOperationsMember