Financial Highlights (Tables)

6 Months Ended

Mar. 31, 2023

Investment Company [Abstract]

Schedule of Investment Company, Financial Highlights

The financial highlights for the Company are as follows:

	Six months ended March 31,
Per share data:(1)	2023			2022
Net asset value at beginning of period	$	14.89		$	15.19
Net increase in net assets as a result of issuance of DRIP shares	—			—			(2)
Net increase in net assets as a result of repurchases of shares	0.01			—
Distributions declared:
From net investment income	(0.66)			(0.60)
Net investment income	0.77			0.52
Net realized gain (loss) on investment transactions	(0.01)			0.08
Net change in unrealized appreciation (depreciation) on investment transactions(3)	(0.27)			0.16
Net asset value at end of period	$	14.73		$	15.35
Per share market value at end of period	$	13.56		$	15.21
Total return based on market value(4)	14.90		%	0.00		%	(5)
Number of common shares outstanding	170,144,126			170,895,670

	Six months ended March 31,
Listed below are supplemental data and ratios to the financial highlights:	2023	2022
Ratio of net investment income to average net assets*	10.45%	6.80%
Ratio of total expenses to average net assets*(6)	10.60%	6.35%
Ratio of management fee waiver to average net assets(7)	—%	(0.07)%
Ratio of incentive fees to average net assets(6)	1.34%	0.30%
Ratio of excise tax to average net assets(6)	0.10%	—%
Ratio of net expenses (without incentive fees) to average net assets*(6)(7)	9.26%	5.98%
Total return based on average net asset value(8)	3.32%	4.99%
Total return based on average net asset value - annualized(8)	6.67%	10.02%
Net assets at end of period	$2,506,145	$2,623,549
Average debt outstanding	$3,069,131	$2,740,594
Average debt outstanding per share	$18.04	$16.04
Portfolio turnover*	14.38%	30.53%
Asset coverage ratio(9)	179.80%	187.55%
Asset coverage ratio per unit(10)	$1,798	$1,876
Average market value per unit:(11)
2018 Debt Securitization	N/A	N/A
GCIC 2018 Debt Securitization	N/A	N/A
MS Credit Facility II	N/A	N/A
JPM Credit Facility	N/A	N/A
2024 Notes	$963	$1,017
2026 Notes	$862	$965
2027 Notes	$829	$943
Adviser Revolver	N/A	N/A

* Annualized for periods less than one year, unless otherwise noted.

(1)Based on actual number of shares outstanding at the end of the corresponding period or the weighted average shares outstanding for the period, unless otherwise noted, as appropriate.

(2)Represents an amount less than $0.01

(3)Includes the impact of different share amounts as a result of calculating certain per share data based on weighted average shares outstanding during the period and certain per share data based on the shares outstanding as of the dividend record date.

(4)Total return based on market value assumes distributions are reinvested in accordance with the DRIP. Total return does not include sales load.

(5)Represents an amount less than 0.01%

(6)Incentive fees and excise taxes are not annualized in the calculation.

(7)For the six months ended March 31, 2022, base management fee waiver is not annualized in the calculation.

(8)Total return based on average net asset value is calculated as (a) the net increase (decrease) in net assets resulting from operations divided by (b) the daily average of total net assets. Total return does not include sales load.

(9)In accordance with the 1940 Act, with certain limited exceptions, the Company is currently allowed to borrow amounts such that its asset coverage, as defined in the 1940 Act, is at least 150% after such borrowing.

(10)Asset coverage ratio per unit is the ratio of the carrying value of our total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage ratio per unit is expressed in terms of dollar amounts per $1,000 of indebtedness.

(11)Not applicable since such senior securities are not registered for public trading, with the exception of the 2024 Notes, 2026 Notes and the 2027 Notes. The average market value per unit calculated for the 2024 Notes, 2026 Notes, and the 2027 Notes is based on the average monthly prices of such notes and is expressed in terms of dollar amounts per $1,000 of indebtedness.