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Long-term Debt (Detail Textuals 1) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 6 Months Ended |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Apr. 05, 2012 Cash Flow Hedging Interest Rate Swap Agreements Agreement | Apr. 05, 2012 Cash Flow Hedging Interest Rate Swap Agreements Interest rate swap agreement one | Apr. 05, 2012 Cash Flow Hedging Interest Rate Swap Agreements Interest rate swap agreement two | Dec. 24, 2013 Cash Flow Hedging Interest Rate Swap Agreements Interest rate swap agreement three | Dec. 31, 2013 Minimum Warrants Call Options | Dec. 31, 2013 Maximum Warrants Call Options | Dec. 31, 2013 Convertible Notes Payable Day | May 16, 2007 Convertible Notes Payable | Dec. 31, 2013 Convertible Notes Payable Call Options | Dec. 31, 2013 Convertible Notes Payable Non-Cash Interest Expense | Dec. 31, 2013 Convertible Notes Payable Warrants | Dec. 31, 2013 Convertible Notes Payable Minimum
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 | $ 68.31 | $ 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. |  |  |  |  |
Percent of sale price of stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00%
Threshold trading days of note |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |
Measurement period for shares and conversion price |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |
Threshold of share and conversion price |  |  |  |  |  |  |  |  |  | 5 days |  |  |  |  |
Measurement period for shares and notes price |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |
Note percent of average product closing price |  |  |  |  |  |  |  |  |  | 97.00% |  |  |  |  |
Percent of notes to be paid in cash |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Effective interest rate for the notes |  |  |  |  |  |  |  |  |  | 6.90% |  |  |  |  |
Proceed from notes payable |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |
Fair value of the liability component of notes |  |  |  |  |  |  |  |  |  |  | 221,900,000 |  |  |  |
Fair value of equity component note |  |  |  |  |  |  |  |  |  | 78,100,000 |  |  |  |  |
Debt discount amortization period |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |
Unamortized debt discount | 4,653,000 |  | 11,421,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the notes | 405,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt issuance costs | 13,222,000 | 612,000 |  |  |  |  |  |  |  | 7,800,000 |  |  |  |  |
Unamortized debt issuance expense | 6,029,000 |  | 3,522,000 |  |  |  |  |  |  | 5,800,000 |  |  |  |  |
Debt issuance costs attributable to conversion option |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
Proceeds from sale of notes receivable |  |  |  |  |  |  |  |  |  | 45,500,000 |  |  |  |  |
Repurchases of common stock, shares |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Purchase of call option |  |  |  |  |  |  |  |  |  |  |  | 84,400,000 |  |  |
Purchase of common stock |  |  |  |  |  |  |  |  |  |  |  | 5.5 |  |  |
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 |
Swap agreements |  |  |  | $ 100,000,000 | $ 50,000,000 | $ 50,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |
Number of floating to fixed interest rate swap agreements |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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