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Stock-Based Compensation - Summary of activity related to SSARs/non-qualified stock options and RSUs/restricted shares issued (Details 1) (USD $)
6 Months Ended
Dec. 31, 2014
SSARs/ Non-qualified Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, June 30, 2014 91,950caci_ShareBasedCompensationArrangementByShareBasedPaymentEquityInstrumentsAwardsAndOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= caci_StockSettledStockAppreciationRightsAndStockOptionsMember
Granted   
Exercised/Issued (18,640)caci_ShareBasedCompensationArrangementByShareBasedPaymentEquityInstrumentsAwardAndOptionsExercisedInPeriod
/ us-gaap_AwardTypeAxis
= caci_StockSettledStockAppreciationRightsAndStockOptionsMember
Forfeited/Lapsed   
Outstanding, December 31, 2014 73,310caci_ShareBasedCompensationArrangementByShareBasedPaymentEquityInstrumentsAwardsAndOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= caci_StockSettledStockAppreciationRightsAndStockOptionsMember
RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, June 30, 2014 838,242us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Granted 297,050us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Exercised/Issued (224,276)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Forfeited/Lapsed (28,173)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Outstanding, December 31, 2014 882,843us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted average grant date fair value for RSUs 78.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember