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Long-term Debt - Summary of long-term debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 1,081,962us-gaap_DebtInstrumentCarryingAmount $ 1,285,469us-gaap_DebtInstrumentCarryingAmount
Less unamortized debt issuance costs (4,247)us-gaap_UnamortizedDebtIssuanceExpense (5,178)us-gaap_UnamortizedDebtIssuanceExpense
Total long-term debt 1,077,715us-gaap_LongTermDebt 1,280,291us-gaap_LongTermDebt
Less current portion (41,563)us-gaap_LongTermDebtCurrent (41,563)us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion 1,036,152us-gaap_LongTermDebtNoncurrent 1,238,728us-gaap_LongTermDebtNoncurrent
Bank credit facility - Term Loan    
Debt Instrument [Line Items]    
Principal amount of long-term debt 779,297us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= caci_BankCreditFacilityTermLoanMember
810,469us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= caci_BankCreditFacilityTermLoanMember
Bank credit facility - Revolving Facility    
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 302,665us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
$ 475,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember