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Long-Term Debt (Convertible Notes Payable) (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Jul. 31, 2012 | Jun. 30, 2012 agreement | Jun. 30, 2013 | Jun. 30, 2012 agreement | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 Warrants [Member] | Jun. 30, 2013 Convertible Notes Payable [Member] | May 16, 2007 Convertible Notes Payable [Member] | Jun. 30, 2013 Convertible Notes Payable [Member] Call Options [Member] | Jun. 30, 2013 Convertible Notes Payable [Member] Non-Cash Interest Expense [Member] | Jun. 30, 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] | Jun. 30, 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 |  |  |  |  | $ 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. |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate for the Notes |  |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |
Fair value of the liability component of Notes |  |  |  |  |  |  |  |  | 221,900,000 |  |  |  |  |  |
Proceed from notes payable |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |  |  |  |  |  |  |  | 78,100,000 |  |  |  |  |  |  |
Debt discount amortization period |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Unamortized debt discount |  | 24,289,000 | 11,421,000 | 24,289,000 |  |  |  |  |  |  |  |  |  |  |
Fair value of the Notes |  |  | 333,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Value of Notes over principal if converted |  |  |  | 48,400,000 |  |  |  |  |  |  |  |  |  |  |
Total debt issuance costs |  |  |  |  |  |  |  | 7,800,000 |  |  |  |  |  |  |
Unamortized debt issuance expense |  | 4,654,000 | 3,522,000 | 4,654,000 | 11,400,000 | 24,300,000 |  | 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 | 2,000,000 | 2,000,000 |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |
Purchase of call option |  |  |  |  |  |  |  |  |  | 84,400,000 |  |  |  |  |
Purchase of common stock |  |  |  |  |  |  |  |  |  | 5,500,000 |  |  |  |  |
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 |  |  |
Proceeds from sales of warrant |  |  |  |  |  |  |  |  |  |  |  | 56,500,000 |  |  |
Number of floating to fixed interest rate swap agreements |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreements |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 50,000,000 |

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- Definition The cash outflow for derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3505-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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- Definition Cash received from principal payments made on loans related to operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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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