Represents the number of additional PRSUs earned pursuant to condition.

No definition available.

Name:	caci_AdditionalPerformanceBasedRestrictedStockUnitsEarnedPursuantToCondition
Namespace Prefix:	caci_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents information about average share price determination period.

+ References

No definition available.

+ Details

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Namespace Prefix:	caci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Cumulative equity instruments awarded.

+ References

No definition available.

+ Details

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Namespace Prefix:	caci_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Cumulative equity instruments forfeited.

+ References

No definition available.

+ Details

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Namespace Prefix:	caci_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Service vesting condition which stipulates that 50 percent of the earned award will vest after four years.

+ References

No definition available.

+ Details

Name:	caci_PercentageOfEarnedAwardVestingAfterFourYears
Namespace Prefix:	caci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Service vesting condition which stipulates that 50 percent of the earned award will vest after three years.

+ References

No definition available.

+ Details

Name:	caci_PercentageOfEarnedAwardVestingAfterThreeYears
Namespace Prefix:	caci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of potential additional PRSUs to be earned pursuant to condition.

+ References

No definition available.

+ Details

Name:	caci_PotentialAdditionalPerformanceBasedRestrictedStockUnitsToBeEarnedPursuantToCondition
Namespace Prefix:	caci_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Period in which equity awards can be granted under stock incentive plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	caci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Details

Name:	us-gaap_AwardTypeAxis=caci_PerformanceBasedRestrictedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=caci_September2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=caci_September2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=caci_September2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=caci_TwoThousandSixStockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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STOCK PLANS AND STOCK-BASED COMPENSATION (Detail Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits recognized	$ 1.6	$ 1.2	$ 3.5
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period to establish average share price for performance measurement	90 days
Percentage of earned award vesting after three years	50.00%
Percentage of earned award vesting after four years	50.00%
PRSUs \| September 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	180,570
Additional PRSUs earned pursuant to condition	26,957
PRSUs \| September 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	208,160
Additional PRSUs earned pursuant to condition	11,811
PRSUs \| September 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	193,420
Potential additional PRSUs to be earned pursuant to condition	193,420
2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, expiration period	10 years
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants	1,200,000
Cumulative equity instruments awarded	41,756
Cumulative equity instruments forfeited	52,169