Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2025		Sep. 30, 2024
Assets
Investments, at fair value	$ 8,621,220	[1]	$ 8,235,411	[2]
Cash and cash equivalents	103,136		123,120
Foreign currencies (cost of $13,763 and $7,973, respectively)	13,791		8,044
Restricted cash and cash equivalents	129,457		227,152
Restricted foreign currencies (cost of $0 and $1,219, respectively)	0		1,236
Interest receivable	65,743		74,036
Net unrealized appreciation on derivatives	11,636		29,490
Other assets	4,882		5,267
Total Assets	8,949,865		8,703,756
Liabilities
Debt	4,833,150		4,624,791
Less unamortized debt issuance costs	(26,232)		(25,361)
Debt less unamortized debt issuance costs	4,806,918		4,599,430
Interest payable	50,473		45,701
Management and incentive fees payable	40,869		33,619
Accrued trustee fees	267		178
Accounts payable and other liabilities	7,840		10,299
Total Liabilities	4,906,367		4,689,227
Commitments and Contingencies (Note 8)
Net Assets
Preferred stock, par value $0.001 per share, 1,000,000 shares authorized, zero shares issued and outstanding as of March 31, 2025 and September 30, 2024	0		0
Common stock, par value $0.001 per share, 500,000,000 shares authorized, 268,831,114 shares issued and outstanding as of March 31, 2025; 350,000,000 shares authorized, 264,277,128 shares issued and outstanding as of September 30, 2024	269		264
Paid in capital in excess of par	4,237,261		4,167,258
Distributable earnings (losses)	(194,032)		(152,993)
Total Net Assets	4,043,498		4,014,529
Total Liabilities and Total Net Assets	$ 8,949,865		$ 8,703,756
Number of common shares outstanding (in shares)	268,831,114		264,277,128
Net asset value per common share (in dollars per share)	$ 15.04		$ 15.19
Non-controlled/non-affiliate company investments
Assets
Investments, at fair value	$ 8,345,620	[1]	$ 8,011,824	[2],[3]
Non-controlled affiliate company investments
Assets
Investments, at fair value	263,684	[1]	211,382	[2],[3]
Controlled affiliate company investments
Assets
Investments, at fair value	$ 11,916	[1],[4]	$ 12,205	[2]

[1] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6.

[2] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6.

[3] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns five percent or more of the portfolio company's voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled affiliates for the year ended September 30, 2024 were as follows: Portfolio CompanyFair value as of September 30, 2023 Gross additions(a) Gross reductions(b) Net change in unrealized appreciation (depreciation)Net realized gain (loss)Fair value as of September 30, 2024Interest, dividend and fee incomeAbita Brewing Co. LLC$6,536 $2,166 $(709)$(1,993)$— $6,000 $575 Bayside Opco, LLC22,044 2,758 (699)5,024 — 29,127 3,660 Benetech, Inc.1,353 780 (843)503 — 1,793 9 Elite Dental Partners LLC13,396 5,845 (3,013)(4,532)— 11,696 180 Imperial Optical Midco Inc.— 94,556 — (692)— 93,864 1,008 Opening Day Borrower 111 LLC24,438 27,853 (23,040)(4,272)(43)24,936 629 Rubio's Restaurants, Inc.12,063 3,759 (3,929)6,624 (18,517)— 1,187 SPF Borrower LLC— 34,008 (136)2,781 — 36,653 2,112 Switchfly LLC7,254 6,180 (5,378)1,157 (1,900)7,313 88 Total Non-Controlled Affiliates$87,084 $177,905 $(37,747)$4,600 $(20,460)$211,382 $9,448  (a) Gross additions could include increases in the cost basis of investments resulting from new investments, amounts related to PIK interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement of an existing portfolio company into this affiliated category from a different category. (b) Gross reductions could include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, the amortization of premiums, the reversal of capitalized PIK for non-accrual positions and the exchange of one or more existing securities for one or more new securities.

[4] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” of and “control” this portfolio company as the Company owns more than 25% of the portfolio company's outstanding voting securities or has the power to exercise control over management or policies of such portfolio company (including through a management agreement) (“controlled affiliate”). Transactions related to investments in controlled affiliates for the six months ended March 31, 2025 were as follows: Portfolio CompanyFair value as of September 30, 2024 Gross additions(a) Gross reductions(b) Net change in unrealized appreciation (depreciation)Net realized gain (loss)Fair value as of March 31, 2025Interest, dividend and fee incomeMMan Acquisition Co.$12,205 $238 $— $(527)$— $11,916 $249 Total Controlled Affiliates$12,205 $238 $— $(527)$— $11,916 $249  (a) Gross additions could include increases in the cost basis of investments resulting from new investments, amounts related to PIK interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement of an existing portfolio company into this affiliated category from a different category. (b) Gross reductions could include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the amortization of premiums, the reversal of capitalized PIK for non-accrual positions and the exchange of one or more existing securities for one or more new securities.