Accrued incentive fee earned based on investment performance.

No definition available.

Name:	geg_AccruedIncentiveFeeEarnedBasedOnInvestmentPerformance
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Incentive fee earned as percentage on investment performance.

+ References

No definition available.

+ Details

Name:	geg_IncentiveFeeEarnedAsPercentageOnInvestmentPerformance
Namespace Prefix:	geg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage entitled of rent collected.

+ References

No definition available.

+ Details

Name:	geg_PercentageEntitledOfRentCollected
Namespace Prefix:	geg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of management fee rate.

+ References

No definition available.

+ Details

Name:	geg_PercentageOfManagementFeeRate
Namespace Prefix:	geg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Proceeds from federal agencies.

+ References

No definition available.

+ Details

Name:	geg_ProceedsFromFederalAgencies
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Remaining balance in advance payments from federal agency.

+ References

No definition available.

+ Details

Name:	geg_RemainingBalanceInAdvancePaymentsFromFederalAgency
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

+ Details

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981

+ Details

Name:	us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126938201&loc=d3e55302-109406

+ Details

Name:	us-gaap_UnbilledContractsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=geg_GECCAndOtherPrivateFundsManagedByGECMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=geg_EquipmentSalesAndServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=geg_EquipmentRentalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=geg_CentersForMedicareAndMedicaidServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
Revenue - Additional Information (Details) - USD ($)	Sep. 30, 2022	Jun. 30, 2020	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Contract with customer liability	$ 0		$ 0
Incentive fee earned as percentage on investment performance	20.00%
Accrued incentive fees as per the terms of investment management agreements	$ 0
Minimum
Disaggregation Of Revenue [Line Items]
Percentage of management fee rates	1.00%
Equipment Lease Term	10 months
Maximum
Disaggregation Of Revenue [Line Items]
Percentage of management fee rates	1.50%
Equipment Lease Term	36 months
Funds
Disaggregation Of Revenue [Line Items]
Percentage entitled of rent collected	4.00%
Equipment Sales and Service \| Accounts Receivable
Disaggregation Of Revenue [Line Items]
Unbilled revenue	$ 200,000		300,000
Equipment Rental
Disaggregation Of Revenue [Line Items]
Contract with customer liability	1,000,000.0		900,000
Equipment Rental \| Accounts Receivable
Disaggregation Of Revenue [Line Items]
Unbilled revenue	100,000		100,000
Centers for Medicare and Medicaid Services
Disaggregation Of Revenue [Line Items]
Proceeds from federal agency		$ 4,400,000
Remaining balance in advance payments from federal agency	$ 300,000		$ 300,000