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Long-Term Debt (Convertible Notes Payable) (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Sep. 30, 2012
Convertible Notes Payable [Member]
May 16, 2007
Convertible Notes Payable [Member]
Sep. 30, 2012
Convertible Notes Payable [Member]
Call Options [Member]
Sep. 30, 2012
Convertible Notes Payable [Member]
Non-Cash Interest Expense [Member]
Sep. 30, 2012
Convertible Notes Payable [Member]
Warrants [Member]
Jun. 30, 2012
Cash Flow Hedging [Member]
Jun. 30, 2012
Floating To Fixed Interest Rate Swap Agreements Two [Member]
Sep. 30, 2012
Minimum [Member]
Debt Instrument [Line Items]                      
Conversion rate of notes into shares       18.2989              
Face value of convertible notes       $ 1,000              
Contingently issuable shares which may result from the conversion of notes 13,228                    
Initial conversion price per share       $ 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            
Threshold of share and conversion price 20 days                    
Measurement period for shares and conversion price 30 days                    
Percent of sale price of stock                     130.00%
Note percent of average product closing price 97.00%                    
Threshold Of Note And Stock Price 5 days                    
Measurement Period For Shares And Notes Price 10 days                    
Percent of notes to be paid in cash 100.00%                    
Proceed from notes payable       300,000,000              
Debt discount amortization period       7 years              
Unamortized debt discount 21,149,000   24,289,000                
Fair value of the Notes 331,900,000                    
Total debt issuance costs       7,800,000              
Debt issuance cost amortized to interest expense 4,939,000 4,733,000   5,800,000              
Debt issuance costs attributable to conversion option       2,000,000              
Purchase of common stock           5,500,000          
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       5,500,000              
Warrant's exercise price $ 68.31 $ 68.31           $ 68.31      
Proceeds from sales of warrant               56,500,000      
Number of floating to fixed interest rate swap agreements     2                
Swap agreements                 100,000,000 50,000,000  
Repurchases of common stock, shares       1,000,000              
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt       78,100,000              
Proceeds from Sale of Notes Receivable       $ 45,500,000