Investments (Tables)

12 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Fair Value, Assets Measured on Recurring Basis

Investments as of September 30, 2023 and September 30, 2022 consisted of the following:

	As of September 30, 2023						As of September 30, 2022
	Principal		Amortized Cost		Fair Value		Principal		Amortized Cost		Fair Value
Senior secured	$	518,721	$	527,449	$	503,985	$	519,188	$	518,216	$	472,873
One stop	4,812,987		4,763,128		4,678,099		4,801,600		4,786,118		4,668,609
Second lien	32,173		33,514		29,154		25,801		29,337		23,240
Subordinated debt	8,907		7,866		7,945		3,869		3,814		3,815
Equity	N/A		261,879		297,430		N/A		232,119		277,819
Total	$	5,372,788	$	5,593,836	$	5,516,613	$	5,350,458	$	5,569,604	$	5,446,356

Schedules of Portfolio Composition at Amortization Cost and Fair Value

The following tables show the portfolio composition by geographic region at amortized cost and fair value as a percentage of total investments in portfolio companies. The geographic composition is determined by the location of the corporate headquarters of the portfolio company, which is not always indicative of the primary source of the portfolio company’s business.

	As of September 30, 2023				As of September 30, 2022
Amortized Cost:
United States
Mid-Atlantic	$	936,563	16.7	%	$	872,311	15.7	%
Midwest	1,061,739		19.0		1,043,468		18.7
West	895,353		16.0		985,463		17.7
Southeast	1,092,833		19.6		1,084,332		19.5
Southwest	487,270		8.7		461,627		8.3
Northeast	461,711		8.3		491,675		8.8
Canada	170,492		3.1		212,701		3.8
United Kingdom	308,977		5.5		263,815		4.7
Australia	17,050		0.3		17,177		0.3
Luxembourg	29,523		0.5		25,476		0.5
Netherlands	80,112		1.4		61,319		1.1
Finland	30,455		0.5		30,386		0.5
Sweden	18,099		0.3		16,213		0.3
Israel	508		0.0	*	508		0.0	*
Denmark	3,151		0.1		3,133		0.1
Total	$	5,593,836	100.0	%	$	5,569,604	100.0	%
Fair Value:
United States
Mid-Atlantic	$	937,002	17.0	%	$	843,796	15.5	%
Midwest	1,046,284		19.0		1,024,529		18.8
West	887,364		16.1		980,751		18.0
Southeast	1,094,393		19.8		1,082,651		19.9
Southwest	484,949		8.8		459,971		8.4
Northeast	448,383		8.1		479,291		8.8
Canada	161,668		2.9		207,537		3.8
United Kingdom	287,313		5.2		225,308		4.2
Australia	16,075		0.3		16,248		0.3
Luxembourg	28,486		0.5		23,978		0.4
Netherlands	69,730		1.3		53,140		1.0
Finland	32,488		0.6		29,813		0.5
Sweden	18,650		0.3		15,709		0.3
Israel	612		0.0	*	508		0.0	*
Denmark	3,216		0.1		3,126		0.1
Total	$	5,516,613	100.0	%	$	5,446,356	100.0	%

* Represents an amount less than 0.1%

The industry compositions of the portfolio at amortized cost and fair value as of September 30, 2023 and September 30, 2022 were as follows:

	As of September 30, 2023				As of September 30, 2022
Amortized Cost:
Aerospace and Defense	$	24,860	0.4	%	$	65,825	1.2	%
Airlines	955		0.0	*	961		0.0	*
Auto Components	41,234		0.7		41,487		0.7
Automobiles	273,381		4.9		262,821		4.7
Beverages	53,386		1.0		59,650		1.1
Biotechnology	1,769		0.0	*	1,769		0.0	*
Building Products	18,282		0.3		17,764		0.3
Chemicals	87,729		1.6		87,657		1.6
Commercial Services and Supplies	156,336		2.8		137,435		2.5
Communications Equipment	11,448		0.2		11,414		0.2
Containers and Packaging	46,372		0.8		44,094		0.8
Distributors	—		—		5,942		0.1
Diversified Consumer Services	271,430		4.9		241,453		4.3
Diversified Financial Services	44,183		0.8		27,160		0.5
Diversified Telecommunication Services	1,601		0.0	*	1,609		0.0	*
Electronic Equipment, Instruments and Components	24,389		0.4		137,087		2.5
Energy Equipment and Services	4,605		0.1		4,700		0.1
Food and Staples Retailing	62,592		1.1		83,134		1.5
Food Products	154,596		2.8		135,841		2.4
Healthcare Equipment and Supplies	136,283		2.4		141,925		2.5
Healthcare Providers and Services	468,748		8.4		492,321		8.8
Health Care Technology	220,862		4.0		197,946		3.6
Hotels, Restaurants and Leisure	130,946		2.3		132,351		2.4
Household Durables	6,688		0.1		8,897		0.2
Household Products	5,410		0.1		5,473		0.1
Industrial Conglomerates	39,570		0.7		31,560		0.6
Insurance	247,825		4.4		232,074		4.2
Internet and Catalog Retail	67,793		1.2		61,193		1.1
IT Services	270,772		4.8		264,343		4.8
Leisure Products	11,557		0.2		11,797		0.2
Life Sciences Tools & Services	72,065		1.3		50,125		0.9
Machinery	34,336		0.6		34,594		0.6
Marine	19,490		0.4		18,813		0.3
Media	6,351		0.1		6,396		0.1
Multiline Retail	45,113		0.8		45,090		0.8
Oil, Gas and Consumable Fuels	117,176		2.1		92,234		1.7
Paper and Forest Products	10,481		0.2		10,579		0.2
Personal Products	36,551		0.7		36,654		0.7
Pharmaceuticals	171,783		3.1		154,608		2.8
Professional Services	123,318		2.2		116,650		2.1
Real Estate Management and Development	131,488		2.4		123,697		2.2
Road and Rail	38,921		0.7		35,801		0.6
Software	1,462,611		26.2		1,410,563		25.3
Specialty Retail	313,197		5.6		365,734		6.6
Technology Hardware, Storage and Peripherals	23,546		0.4		23,269		0.4
Textiles, Apparel and Luxury Goods	44,256		0.8		44,882		0.8
Trading Companies and Distributors	38,403		0.7		34,410		0.6
Water Utilities	19,148		0.3		17,822		0.3
Total	$	5,593,836	100.0	%	$	5,569,604	100.0	%

* Represents an amount less than 0.1%.

	As of September 30, 2023				As of September 30, 2022
Fair Value:
Aerospace and Defense	$	25,557	0.5	%	$	64,365	1.2	%
Airlines	917		0.0	*	926		0.0	*
Auto Components	39,648		0.7		41,026		0.8
Automobiles	270,598		4.9		260,506		4.8
Beverages	49,787		0.9		57,804		1.1
Biotechnology	1,315		0.0	*	1,536		0.0	*
Building Products	18,278		0.3		17,770		0.3
Chemicals	75,851		1.4		79,461		1.5
Commercial Services and Supplies	159,232		2.9		135,584		2.5
Communications Equipment	11,358		0.2		11,162		0.2
Containers and Packaging	45,597		0.8		44,198		0.8
Distributors	—		—		5,941		0.1
Diversified Consumer Services	271,351		4.9		236,896		4.3
Diversified Financial Services	44,147		0.8		26,928		0.5
Diversified Telecommunication Services	1,612		0.0	*	1,628		0.0	*
Electronic Equipment, Instruments and Components	24,967		0.5		138,011		2.5
Energy Equipment and Services	1,353		0.0	*	1,740		0.0	*
Food and Staples Retailing	56,675		1.0		84,744		1.6
Food Products	158,312		2.9		136,802		2.5
Healthcare Equipment and Supplies	132,677		2.4		131,962		2.4
Healthcare Providers and Services	451,795		8.2		444,736		8.2
Health Care Technology	222,984		4.1		200,658		3.7
Hotels, Restaurants and Leisure	132,972		2.4		134,159		2.5
Household Durables	6,891		0.1		9,275		0.2
Household Products	5,217		0.1		5,265		0.1
Industrial Conglomerates	39,056		0.7		30,407		0.6
Insurance	246,424		4.5		226,158		4.2
Internet and Catalog Retail	70,228		1.3		61,299		1.1
IT Services	260,877		4.7		249,240		4.6
Leisure Products	13,162		0.3		13,478		0.2
Life Sciences Tools & Services	72,077		1.3		49,478		0.9
Machinery	33,082		0.6		31,750		0.6
Marine	19,053		0.4		18,399		0.3
Media	6,179		0.1		6,503		0.1
Multiline Retail	45,138		0.8		45,138		0.8
Oil, Gas and Consumable Fuels	117,897		2.2		90,054		1.7
Paper and Forest Products	9,991		0.2		10,640		0.2
Personal Products	34,489		0.6		33,869		0.6
Pharmaceuticals	162,335		2.9		150,263		2.8
Professional Services	123,807		2.2		116,622		2.1
Real Estate Management and Development	128,483		2.3		119,120		2.2
Road and Rail	39,047		0.7		35,742		0.7
Software	1,455,863		26.4		1,401,424		25.7
Specialty Retail	308,126		5.6		367,521		6.7
Technology Hardware, Storage and Peripherals	23,350		0.4		22,852		0.4
Textiles, Apparel and Luxury Goods	43,696		0.8		42,302		0.8
Trading Companies and Distributors	36,734		0.7		33,597		0.6
Water Utilities	18,428		0.3		17,417		0.3
Total	$	5,516,613	100.0	%	$	5,446,356	100.0	%

* Represents an amount less than 0.1%.