INCOME TAXES - Schedule of Income Loss Before Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 231,982	$ 207,641	$ 187,332
Foreign	16,637	15,971	14,190
Income before income taxes	$ 248,619	$ 223,612	$ 201,522

Income loss from continuing operations before income taxes and noncontrolling interest.

No definition available.

Name:	caci_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterest
Namespace Prefix:	caci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

+ Details

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

- References

No definition available.

+ Details

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