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Long-Term Debt (Convertible Notes Payable) (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Dec. 31, 2011
Convertible Notes Payable [Member]
years
May 16, 2007
Convertible Notes Payable [Member]
Dec. 31, 2011
Convertible Notes Payable [Member]
Call Options [Member]
Dec. 31, 2011
Convertible Notes Payable [Member]
Non-Cash Interest Expense [Member]
Dec. 31, 2011
Convertible Notes Payable [Member]
Warrants [Member]
Debt Instrument [Line Items]                    
Conversion rate of notes into shares           18.2989        
Face value of convertible notes           $ 1,000        
Initial conversion price per share   $ 54.65   $ 54.65   $ 54.65        
Debt conversion circumstances     1) if the last reported sale price of CACI stock is greater than or equal to 130 percent of the applicable conversion price for at least 20 trading days in the period of 30 consecutive trading days ending on the last trading day of the preceding fiscal quarter; 2) during the five consecutive business day period immediately after any ten consecutive trading day period (the note measurement period) in which the average of the trading price per $1,000 principal amount of convertible note was equal to or less than 97 percent of the average product of the closing price of a share of the Company's common stock and the conversion rate of each date during the note measurement period; 3) upon the occurrence of certain corporate events constituting a fundamental change, as defined in the indenture governing the Notes; or 4) during the last three-month period prior to maturity. CACI is required to satisfy 100 percent of the principal amount of these notes solely in cash, with any amounts above the principal amount to be satisfied in common stock.              
Effective interest rate for the Notes     2.125%     6.90%        
Fair value of the liability component of notes             221,900,000      
Proceed from notes payable           300,000,000        
Fair value of equity components of notes           78,100,000        
Debt discount amortization period (in years)           7        
Unamortized debt discount 30,403,000   30,403,000   36,313,000          
Fair value of the notes 354,000,000   354,000,000              
Total debt issuance costs           7,800,000        
Debt issuance cost amortized to interest expense 4,775,000 4,579,000 9,508,000 9,120,000   5,800,000        
Debt issuance costs attributable to conversion option           2,000,000        
Debt issuance cost amortization period (in years)           7        
Proceeds from sale of notes           45,500,000        
Purchase of common stock               5.5    
Purchase of call option               84,400,000    
Income tax benefit on discount on issue of notes           32,800,000        
Deferred tax liability                 30,700,000  
Common shares issuable under the sale of warrants           5.5        
Warrants exercise price $ 68.31 $ 68.31 $ 68.31 $ 68.31           $ 68.31
Proceeds from sales of warrant                   $ 56,500,000
Repurchases of common stock, shares           1