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Legal Proceedings (Details)	Jun. 30, 2021 state
Commitments and Contingencies Disclosure [Abstract]
Number of states seeking recovery of unclaimed property	27
Number of states requesting payment	19

X

- Definition

Number of States Requesting Payments

+ References

No definition available.

+ Details

Name:	gic_NumberOfStatesRequestingPayments
Namespace Prefix:	gic_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states being audited and seeking recovery of unclaimed property.

+ References

No definition available.

+ Details

Name:	gic_NumberOfStatesSeekingRecoveryOfUnclaimedProperty
Namespace Prefix:	gic_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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