Transactions with Controlled Companies - USES Corp. (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jun. 29, 2016	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Jun. 15, 2016
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest Income		$ 174,318	$ 146,271
Interest Receivable		18,781		$ 12,925
Other Receivables		$ 1,309		$ 745
USES Corp. | Common Stock
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Units (in shares)	268,962
USES Corp. | Common Stock | Term Loan A
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Units (in shares)	169,062				99,900
USES Corp. | Term Loan A
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Principal amount	$ 2,200				$ 1,300
Reportable Legal Entities | Subsidiaries | USES Corp.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest	99.96%	99.96%		99.96%
Reportable Legal Entities | Subsidiaries | USES Corp.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest Income		$ 173	51
Additions		6,000	0
Total Interest Income Capitalized as PIK		114	0
Interest Receivable		3		$ 1
Other Receivables		62		62
Reportable Legal Entities | Subsidiaries | Universal Turbine Parts, LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest Income		688	$ 593
Interest Receivable		9		7
Other Receivables		$ 17		$ 17