v3.5.0.2

Note 14 - Recent Accounting Pronouncements (Details Textual) - Reclassification of Current Deferred Tax Assets to Offset Long-term Deferred Tax Liabilities [Member] $ in Millions	3 Months Ended
	Sep. 30, 2016 USD ($)
Fiscal 2016 Period [Member]
Prior Period Reclassification Adjustment	$ 5
Current Period Reclassification Adjustment	$ 1

X

- Definition

The amount of a reclassification adjustment made to current period financial statement amounts.

+ References

No definition available.

+ Details

Name:	cgi_CurrentPeriodReclassificationAdjustment
Namespace Prefix:	cgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_NewAccountingPronouncementEarlyAdoptionAxis=cgi_ReclassificationOfCurrentDeferredTaxAssetsToOffsetLongTermDeferredTaxLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreationDateAxis=cgi_Fiscal2016PeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: