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Long-Term Debt (Convertible Notes Payable) (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Jul. 31, 2012
Sep. 30, 2012
Mar. 31, 2013
Jun. 30, 2012
agreement
Mar. 31, 2012
Mar. 31, 2013
Convertible Notes Payable [Member]
May 16, 2007
Convertible Notes Payable [Member]
Mar. 31, 2013
Convertible Notes Payable [Member]
Call Options [Member]
Mar. 31, 2013
Convertible Notes Payable [Member]
Non-Cash Interest Expense [Member]
Mar. 31, 2013
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]
Mar. 31, 2013
Minimum [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              
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     14,716,000 24,289,000                  
Fair value of the Notes     338,600,000                    
Total debt issuance costs           7,800,000              
Debt issuance costs attributable to conversion option           2,000,000              
Unamortized Debt Issuance Expense     3,910,000 4,654,000   5,800,000              
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              
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 2     6   1              
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt           78,100,000              
Proceeds from Sale of Notes Receivable           $ 45,500,000