Non-Controlling Interests - Summary of Non-controlling Interests Balance on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Jun. 30, 2025
Balance as of
Total non-controlling interests	$ 0	$ 10,348
Consolidated Funds
Balance as of
Permanent equity	$ 0	$ 10,348

Minority interest including temporary equity and preferred stock classified as liability.

No definition available.

Name:	geg_MinorityInterestIncludingTemporaryEquityAndPreferredStockClassifiedAsLiability
Namespace Prefix:	geg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant