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Related Party Transactions - Schedule of Activity and Outstanding Balances Between Managed Investment Products and Company (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Related Party Transaction [Line Items]
Unrealized gain (loss) on investment	$ 2,560	$ (826)	$ 658	$ (1,809)
Managed Investment Products
Related Party Transaction [Line Items]
Investment management revenues receivable	751		751		$ 746
Receivable for reimbursable expenses paid	185		185		158
GECC | Managed Investment Products
Related Party Transaction [Line Items]
Unrealized gain (loss) on investment	2,560	(826)	658	(1,809)
Dividend income from GECC	1,322	$ 588	1,846	$ 1,078
Dividends receivable from GECC	$ 450		$ 450		$ 170

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