Summary Of Significant Accounting Policies (Policy)	12 Months Ended
Summary Of Significant Accounting Policies (Policy)	Jun. 30, 2011
Summary Of Significant Accounting Policies
Revenue Recognition	*Revenue Recognition* The Company generates almost all of its revenue from three different types of contractual arrangements: cost-plus-fee contracts, time and materials contracts, and fixed price contracts. Revenue on cost-plus-fee contracts is recognized to the extent of costs incurred plus an estimate of the applicable fees earned. The Company considers fixed fees under cost-plus-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract. For cost-plus-fee contracts that include performance based fee incentives, and that are subject to the provisions of Accounting Standards Codification (ASC) 605-35, Revenue Recognition—Construction-Type and Production-Type Contracts (ASC 605-35), the Company recognizes the relevant portion of the expected fee to be awarded by the customer at the time such fee can be reasonably estimated, based on factors such as the Company's prior award experience and communications with the customer regarding performance. For such cost-plus-fee contracts subject to the provisions of ASC 605-10-S99, Revenue Recognition—SEC Materials (ASC 605-10-S99), the Company recognizes the relevant portion of the fee upon customer approval. Revenue on time and material contracts is recognized to the extent of billable rates times hours delivered for services provided, to the extent of material cost for products delivered to customers, and to the extent of expenses incurred on behalf of the customers. Shipping and handling fees charged to the customers are recognized as revenue at the time products are delivered to the customers. The Company has four basic categories of fixed price contracts: fixed unit price, fixed price-level of effort, fixed price-completion, and fixed price-license. Revenue on fixed unit price contracts, where specified units of output under service arrangements are delivered, is recognized as units are delivered based on the specified price per unit. Revenue on fixed unit price maintenance contracts is recognized ratably over the length of the service period. Revenue for fixed price-level of effort contracts is recognized based upon the number of units of labor actually delivered multiplied by the agreed rate for each unit of labor. A significant portion of the Company's fixed price-completion contracts involve the design and development of complex client systems. For these contracts that are within the scope of ASC 605-35, revenue is recognized on the percentage-of-completion method using costs incurred in relation to total estimated costs. For fixed price-completion contracts that are not within the scope of ASC 605-35, revenue is generally recognized ratably over the service period. The Company's fixed price-license agreements and related services contracts are primarily executed in its international operations. As the agreements to deliver software require significant production, modification or customization of software, revenue is recognized using the contract accounting guidance of ASC 605-35. For agreements to deliver data under license and related services, revenue is recognized as the data is delivered and services are performed. Except for losses on contracts accounted for under ASC 605-10-S99, provisions for estimated losses on uncompleted contracts are recorded in the period such losses are determined. Losses on contracts accounted for under ASC 605-10-S99 are recognized as the services and materials are provided. The Company's contracts may include the provision of more than one of its services. In these situations, and for applicable arrangements, revenue recognition includes the proper identification of separate units of accounting and the allocation of revenue across all elements based on relative fair values, with proper consideration given to the guidance provided by other authoritative literature. Contract accounting requires judgment relative to assessing risks, estimating contract revenue and costs, and making assumptions for schedule and technical issues. Due to the size and nature of many of the Company's contracts, the estimation of total revenue and cost at completion is complicated and subject to many variables. Contract costs include material, labor, subcontracting costs, and other direct costs, as well as an allocation of allowable indirect costs. Assumptions have to be made regarding the length of time to complete the contract because costs also include expected increases in wages and prices for materials. For contract change orders, claims or similar items, the Company applies judgment in estimating the amounts and assessing the potential for realization. These amounts are only included in contract value when they can be reliably estimated and realization is considered probable. Incentives or penalties related to performance on contracts are considered in estimating sales and profit rates, and are recorded when there is sufficient information for the Company to assess anticipated performance. Estimates of award fees for certain contracts are also a factor in estimating revenue and profit rates based on actual and anticipated awards. Long-term development and production contracts make up a large portion of the Company's business, and therefore the amounts recorded in the Company's financial statements using contract accounting methods are material. For federal government contracts, the Company follows U.S. government procurement and accounting standards in assessing the allowability and the allocability of costs to contracts. Due to the significance of the judgments and estimation processes, it is likely that materially different amounts could be recorded if the Company used different assumptions or if the underlying circumstances were to change. The Company closely monitors compliance with, and the consistent application of, its critical accounting policies related to contract accounting. Business operations personnel conduct thorough periodic contract status and performance reviews. When adjustments in estimated contract revenue or costs are required, any changes from prior estimates are generally included in earnings in the current period. Also, regular and recurring evaluations of contract cost, scheduling and technical matters are performed by management personnel who are independent from the business operations personnel performing work under the contract. Costs incurred and allocated to contracts with the U.S. government are scrutinized for compliance with regulatory standards by Company personnel, and are subject to audit by the Defense Contract Audit Agency (DCAA). From time to time, the Company may proceed with work based on client direction prior to the completion and signing of formal contract documents. The Company has a formal review process for approving any such work. Revenue associated with such work is recognized only when it can be reliably estimated and realization is probable. The Company bases its estimates on previous experiences with the client, communications with the client regarding funding status, and its knowledge of available funding for the contract or program. The Company's U.S. government contracts (94.9 percent of total revenue in the year ended June 30, 2011) are subject to subsequent government audit of direct and indirect costs. Incurred cost audits have been completed through June 30, 2005. Management does not anticipate any material adjustment to the consolidated financial statements in subsequent periods for audits not yet started or completed.
Costs Of Revenue	*Costs of Revenue* Costs of revenue include all direct contract costs as well as indirect overhead costs and selling, general and administrative expenses that are allowable and allocable to contracts under federal procurement standards. Costs of revenue also include costs and expenses that are unallowable under applicable procurement standards, and are not allocable to contracts for billing purposes. Such costs and expenses do not directly generate revenue, but are necessary for business operations.
Cash And Cash Equivalents	*Cash and Cash Equivalents* The Company considers all investments with an original maturity of three months or fewer on their trade date to be cash equivalents. The Company classifies investments with an original maturity of more than three months but less than twelve months on their trade date as short-term marketable securities.
Investments In Marketable Securities	*Investments in Marketable Securities* From time to time, the Company invests in marketable securities that are classified as available-for-sale and are reported at fair value. Unrealized gains and losses as a result of changes in the fair value of the available-for-sale investments are recorded as a separate component within accumulated other comprehensive income in the accompanying consolidated balance sheets. For securities classified as trading securities, unrealized gains and losses are reported in the consolidated statement of operations and impact net earnings. The fair value of marketable securities is determined based on quoted market prices at the reporting date for those securities. The cost of securities sold is determined using the specific identification method. Premiums and discounts are amortized over the period from acquisition to maturity, and are included in investment income, along with interest and dividends.
Allowance For Doubtful Accounts	*Allowance For Doubtful Accounts* The Company establishes bad debt reserves against certain billed receivables based upon the latest information available to determine whether invoices are ultimately collectible. Whenever judgment is involved in determining the estimates, there is the potential for bad debt expense and the fair value of accounts receivable to be misstated. Given that the Company primarily serves the U.S. government and that, in management's opinion, the Company has sufficient controls in place to properly recognize revenue, the Company believes the risk to be relatively low that a misstatement of accounts receivable would have a material impact on its consolidated financial statements. Accounts receivable balances are written-off when the balance is deemed uncollectible after exhausting all reasonable means of collection.
Inventories	*Inventories* Inventories are stated at the lower of cost or market using the specific identification cost method, and are recorded within prepaid expenses and other current assets on the accompanying consolidated balance sheets.
Goodwill	*Goodwill* Goodwill represents the excess of costs over the fair value of assets of businesses acquired. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually or if impairment indicators are present. The evaluation includes comparing the fair value of the relevant reporting unit to the carrying value, including goodwill, of such unit. If the fair value exceeds the carrying value, no impairment loss is recognized. However, if the carrying value of the reporting unit exceeds its fair value, the goodwill of the reporting unit may be impaired. Impairment is measured by comparing the derived fair value of the goodwill to its carrying value. The Company has two reporting units—domestic operations and international operations. Its reporting units are the same as its operating segments. Approximately 95 percent of the Company's goodwill is attributable to its domestic operations. The Company estimates the fair value of its reporting units using both an income approach and a market approach. The valuation process considers management's estimates of the future operating performance of each reporting unit. Companies in similar industries are researched and analyzed and management considers the domestic and international economic and financial market conditions, both in general and specific to the industry in which the Company operates, prevailing as of the valuation date. The income approach utilizes discounted cash flows. The Company calculates a weighted average cost of capital for each reporting unit in order to estimate the discounted cash flows. The Company performs its annual testing for impairment of goodwill and other indefinite life intangible assets as of June 30 of each year. The fair value of each of the Company's reporting units as of June 30, 2011 significantly exceeded its carrying value.
Long-Lived Assets (Excluding Goodwill)	*Long-Lived Assets (Excluding Goodwill)* Long-lived assets such as property and equipment and intangible assets subject to amortization are reviewed for impairment whenever events or circumstances indicate that the carrying amount of an asset may not be fully recoverable. An impairment loss would be recognized if the sum of the long-term undiscounted cash flows is less than the carrying amount of the long-lived asset being evaluated. Any write-downs are treated as permanent reductions in the carrying amount of the assets. Property and equipment is recorded at cost. Depreciation of equipment and furniture has been provided over the estimated useful life of the respective assets (ranging from three to eight years) using the straight-line method. Leasehold improvements are generally amortized using the straight-line method over the remaining lease term or the useful life of the improvements, whichever is shorter. Repairs and maintenance costs are expensed as incurred. Separately identifiable intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values. The Company believes that the carrying values of its long-lived assets as of June 30, 2011 and 2010 are fully realizable.
External Software Development Costs	*External Software Development Costs* Costs incurred in creating a software product to be sold or licensed for external use are charged to expense when incurred as indirect costs and selling expenses until technological feasibility has been established for the software. Technological feasibility is established upon completion of a detailed program design or, in its absence, completion of a working software version. Thereafter, all such software development costs are capitalized and subsequently reported at the lower of unamortized cost or estimated net realizable value. Capitalized costs are amortized on a straight-line basis over the remaining estimated economic life of the product.
Supplemental Retirement Savings Plan	*Supplemental Retirement Savings Plan* The Company maintains the CACI International Inc Group Executive Retirement Plan (the Supplemental Savings Plan) and maintains the underlying assets in a Rabbi Trust. The Supplemental Savings Plan is a non-qualified defined contribution supplemental retirement savings plan for certain key employees whereby participants may elect to defer and contribute a portion of their compensation, as permitted by the plan. Each participant directs his or her investments in the Supplemental Savings Plan (see Note 20). A Rabbi Trust is a grantor trust established to fund compensation for a select group of management. The assets of this trust are available to satisfy the claims of general creditors in the event of bankruptcy of the Company. The assets held by the Rabbi Trust are invested in both corporate owned life insurance (COLI) products and in non-COLI products. The COLI products are recorded at cash surrender value in the consolidated financial statements as supplemental retirement savings plan assets and the non-COLI products are recorded at fair value in the consolidated financial statements as supplemental retirement savings plan assets. The amounts due to participants are based on contributions participant investment elections, and other participant activity and are recorded as supplemental retirement savings plan obligations.
Income Taxes	*Income Taxes* Income taxes are accounted for using the asset and liability method whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of assets and liabilities, and their respective tax bases, and operating loss and tax credit carry forwards. The Company accounts for tax contingencies in accordance with updates made to ASC 740-10-25, Income Taxes—Recognition. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities due to a change in tax rates is recognized in income in the period that includes the enactment date. Estimates of the realizability of deferred tax assets are based on the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies. Any interest or penalties incurred in connection with income taxes are recorded as part of income tax expense for financial reporting purposes.
Costs Of Acquisitions	*Costs of Acquisitions* Through June 30, 2009, costs incurred by the Company related to legal, financial and other professional advisors that were directly related to successful acquisitions were capitalized as a cost of the acquisition. Such costs for unsuccessful or terminated acquisition opportunities were expensed when the Company determined that the opportunity would no longer be pursued. Effective July 1, 2009, all such costs associated with acquisitions, successful or unsuccessful, are expensed as incurred.
Foreign Currency Translation	*Foreign Currency Translation* The assets and liabilities of the Company's foreign subsidiaries whose functional currency is other than the U.S. dollar are translated at the exchange rate in effect on the reporting date, and income and expenses are translated at the weighted-average exchange rate during the period. The Company's primary practice is to negotiate contracts in the same currency in which the predominant expenses are incurred, thereby mitigating the exposure to foreign currency fluctuations. The net translation gains and losses are not included in determining net income, but are accumulated as a separate component of shareholders' equity. Foreign currency transaction gains and losses are included in determining net income, but are insignificant. These costs are included as indirect costs and selling expenses in the accompanying consolidated statements of operations.
Earnings Per Share	*Earnings Per Share* Basic earnings per share is computed using the sum of the weighted-average number of shares of common stock outstanding during the period and shares issued during the period are weighted for the portion of the period that they were outstanding. Diluted earnings per share is computed in a manner similar to that used for basic earnings per share after giving effect to the dilutive effects of the exercise of stock settled stock appreciation rights and stock options and the vesting of restricted stock and restricted stock units. In addition, diluted earnings per share reflect the dilutive effects of restricted stock units with performance conditions in the reporting period in which the performance metric is achieved. When applicable, diluted earnings per share reflect the dilutive effects of shares issuable under the Company's $300.0 million of 2.125 percent convertible senior subordinated notes that were issued on May 16, 2007 and mature on May 1, 2014 (the Notes), and warrants to issue 5.5 million shares of CACI common stock at an exercise price of $68.31 per share that were issued in May 2007. Information about the weighted-average number of basic and diluted shares is presented in Note 23.
Fair Value Of Financial Instruments	*Fair Value of Financial Instruments* The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and amounts included in other current assets and current liabilities that meet the definition of a financial instrument approximate fair value because of the short-term nature of these amounts. The fair value of the Company's debt under its bank credit facility approximates its carrying value at June 30, 2011. The fair value of the Company's debt under its bank credit facility was estimated using market data on companies with a corporate rating similar to CACI's that have recently priced credit facilities. The fair value of the Notes is based on quoted market prices (see Note 13).
Concentrations Of Credit Risk	*Concentrations of Credit Risk* Financial instruments that potentially subject the Company to credit risk include accounts receivable and cash equivalents. Management believes that credit risk related to the Company's accounts receivable is limited due to a large number of customers in differing segments and agencies of the U.S. government. Accounts receivable credit risk is also limited due to the credit worthiness of the U.S. government. Management believes the credit risk associated with the Company's cash equivalents is limited due to the credit worthiness of the obligors of the investments underlying the cash equivalents. In addition, although the Company maintains cash balances at financial institutions that exceed federally insured limits, these balances are placed with high quality financial institutions.
Comprehensive Income	*Comprehensive Income* Comprehensive income is the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. Other comprehensive income refers to revenue, expenses, and gains and losses that under U.S. GAAP are included in comprehensive income, but excluded from the determination of net income. The elements within other comprehensive income consist of foreign currency translation adjustments; the changes in the fair value of interest rate swap agreements, net of tax; and differences between actual amounts and estimates based on actuarial assumptions and the effect of changes in actuarial assumptions made under the Company's post-retirement benefit plans, net of tax (see Note 15). As of June 30, 2011 and 2010, accumulated other comprehensive loss included a loss of $2.4 million and $9.1 million, respectively, related to foreign currency translation adjustments and a loss of $0.7 million in both years, related to unrecognized post-retirement medical plan costs.
Use Of Estimates	*Use of Estimates* The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported periods. The significant management estimates include estimated costs to complete fixed-price contracts, estimated award fees for contracts accounted for under ASC 605-35, amortization periods for long-lived intangible assets, recoverability of long-lived assets, reserves for accounts receivable, reserves for contract related matters, reserves for unrecognized tax benefits, contingent consideration amounts to be paid in connection with certain acquisitions completed on or after July 1, 2009 and loss contingencies. Actual results could differ from these estimates.
Commitments And Contingencies	*Commitments and Contingencies* Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated.