Transactions with Affiliated Companies - Additional Information (Details)	12 Months Ended
	Sep. 30, 2025
Minimum
Investments In And Advances To Affiliates [Line Items]
Ownership percentage of voting securities	5.00%
Controlled Affiliates | Maximum
Investments In And Advances To Affiliates [Line Items]
Ownership percentage of voting securities	25.00%
Non-Controlled Affiliates | Minimum
Investments In And Advances To Affiliates [Line Items]
Ownership percentage of voting securities	5.00%
Non-Controlled Affiliates | Maximum
Investments In And Advances To Affiliates [Line Items]
Ownership percentage of voting securities	25.00%