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Subsequent Events (Detail Textual) - Subsequent Event $ in Millions	Apr. 30, 2019 USD ($) Swap
Subsequent Event [Line Items]
Number of interest rate swaps | Swap	3
Aggregate notional amount | $	$ 300.0
Effective date of interest rate swaps	Jul. 01, 2019

X

- Definition

Effective date of interest rate swaps.

+ References

No definition available.

+ Details

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

X

- Definition

Number of interest rate swaps.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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