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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 Ended12 Months Ended15 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Sep. 30, 2011
May 16, 2007
Debt Instrument [Line Items]    
Debt conversion circumstances1) 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 $1,000 principal amount of convertible note was equal to or less than 97 percent of the average product of the closing price of a share of the Company's common stock and the conversion rate of each date during the note measurement period; 3) upon the occurrence of certain corporate events constituting a fundamental change, as defined in the indenture governing the Notes; or 4) during the last three-month period prior to maturity. CACI is required to satisfy 100 percent of the principal amount of these notes solely in cash, with any amounts above the principal amount to be satisfied in common stock.   
Convertible senior subordinated notes rate2.125%   
Unamortized debt discount$ 33,379,000$ 36,313,000$ 33,379,000 
Fair value of the notes334,800,000 334,800,000 
Convertible Notes Payable [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  
Convertible senior subordinated notes rate6.90%   
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 7  
Total debt issuance costs  7,800,000 
Debt issuance cost amortized to interest expenses  5,800,000 
Debt issuance costs attributable to conversion option  2,000,000 
Debt issuance cost amortization period  7 
Proceeds from sale of notes  45,500,000 
Income tax benefit on discount on issue of notes  32,800,000 
Common shares issuable under the sale of warrants  5.5 
Convertible Notes Payable [Member] | Warrants [Member]
    
Debt Instrument [Line Items]    
Warrants exercise price$ 68.31 $ 68.31 
Proceeds from sales of warrant  56,500,000 
Convertible Notes Payable [Member] | Call Options [Member]
    
Debt Instrument [Line Items]    
Purchase of common stock  5.5 
Purchase of call option  84,400,000 
Convertible Notes Payable [Member] | Non-Cash Interest Expense [Member]
    
Debt Instrument [Line Items]    
Deferred tax liability$ 30,700,000 $ 30,700,000