Investments (Tables)

6 Months Ended

Mar. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Fair Value, Assets Measured on Recurring Basis

Investments as of March 31, 2023 and September 30, 2022 consisted of the following:

	As of March 31, 2023						As of September 30, 2022
	Principal		Amortized Cost		Fair Value		Principal		Amortized Cost		Fair Value
Senior secured	$	522,766	$	510,454	$	480,590	$	519,188	$	518,216	$	472,873
One stop	4,883,738		4,831,531		4,708,204		4,801,600		4,786,118		4,668,609
Second lien	27,870		29,392		24,436		25,801		29,337		23,240
Subordinated debt	4,265		4,213		4,150		3,869		3,814		3,815
Equity	N/A		243,105		268,972		N/A		232,119		277,819
Total	$	5,438,639	$	5,618,695	$	5,486,352	$	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 March 31, 2023				As of September 30, 2022
Amortized Cost:
United States
Mid-Atlantic	$	931,743	16.6	%	$	872,311	15.7	%
Midwest	1,059,492		18.9		1,043,468		18.7
West	929,207		16.5		985,463		17.7
Southeast	1,096,888		19.5		1,084,332		19.5
Southwest	499,384		8.9		461,627		8.3
Northeast	444,723		7.9		491,675		8.8
Canada	183,829		3.3		212,701		3.8
United Kingdom	309,094		5.5		263,815		4.7
Australia	17,114		0.3		17,177		0.3
Luxembourg	28,299		0.5		25,476		0.5
Netherlands	68,061		1.2		61,319		1.1
Finland	30,421		0.5		30,386		0.5
Sweden	16,790		0.3		16,213		0.3
Israel	508		0.0	*	508		0.0	*
Denmark	3,142		0.1		3,133		0.1
Total	$	5,618,695	100.0	%	$	5,569,604	100.0	%
Fair Value:
United States
Mid-Atlantic	$	890,143	16.2	%	$	843,796	15.5	%
Midwest	1,033,990		18.8		1,024,529		18.8
West	914,843		16.7		980,751		18.0
Southeast	1,092,345		19.9		1,082,651		20.0
Southwest	494,857		9.0		459,971		8.4
Northeast	431,814		7.9		479,291		8.8
Canada	179,978		3.3		207,537		3.8
United Kingdom	288,421		5.3		225,308		4.1
Australia	16,444		0.3		16,248		0.3
Luxembourg	27,261		0.5		23,978		0.4
Netherlands	61,780		1.1		53,140		1.0
Finland	32,977		0.6		29,813		0.5
Sweden	17,756		0.3		15,709		0.3
Israel	529		0.0	*	508		0.0	*
Denmark	3,214		0.1		3,126		0.1
Total	$	5,486,352	100.0	%	$	5,446,356	100.0	%

The industry compositions of the portfolio at amortized cost and fair value as of March 31, 2023 and September 30, 2022 were as follows:

	As of March 31, 2023				As of September 30, 2022
Amortized Cost:
Aerospace and Defense	$	24,920	0.4	%	$	65,825	1.2	%
Airlines	958		0.0	*	961		0.0	*
Auto Components	41,032		0.7		41,487		0.7
Automobiles	270,511		4.8		262,821		4.7
Beverages	59,901		1.1		59,650		1.1
Biotechnology	1,769		0.0	*	1,769		0.0	*
Building Products	18,001		0.3		17,764		0.3
Chemicals	87,667		1.6		87,657		1.6
Commercial Services and Supplies	166,304		3.0		137,435		2.5
Communications Equipment	11,431		0.2		11,414		0.2
Containers and Packaging	45,639		0.8		44,094		0.8
Distributors	—		—		5,942		0.1
Diversified Consumer Services	255,508		4.5		241,453		4.3
Diversified Financial Services	39,358		0.7		27,160		0.5
Diversified Telecommunication Services	1,605		0.0	*	1,609		0.0	*
Electronic Equipment, Instruments and Components	24,452		0.4		137,087		2.5
Energy Equipment and Services	4,762		0.1		4,700		0.1
Food and Staples Retailing	60,549		1.1		83,134		1.5
Food Products	156,689		2.8		135,841		2.4
Healthcare Equipment and Supplies	136,524		2.4		141,925		2.5
Healthcare Providers and Services	502,195		9.0		492,321		8.8
Health Care Technology	216,919		3.9		197,946		3.6
Hotels, Restaurants and Leisure	136,436		2.4		132,351		2.4
Household Durables	6,345		0.1		8,897		0.2
Household Products	5,439		0.1		5,473		0.1
Industrial Conglomerates	38,671		0.7		31,560		0.6
Insurance	220,188		3.9		232,074		4.2
Internet and Catalog Retail	67,903		1.2		61,193		1.1
IT Services	267,366		4.8		264,343		4.8
Leisure Products	11,788		0.2		11,797		0.2
Life Sciences Tools & Services	72,160		1.3		50,125		0.9
Machinery	34,611		0.6		34,594		0.6
Marine	18,809		0.3		18,813		0.3
Media	6,373		0.1		6,396		0.1
Multiline Retail	45,101		0.8		45,090		0.8
Oil, Gas and Consumable Fuels	115,930		2.1		92,234		1.7
Paper and Forest Products	10,551		0.2		10,579		0.2
Personal Products	36,564		0.7		36,654		0.7
Pharmaceuticals	164,877		2.9		154,608		2.8
Professional Services	121,737		2.2		116,650		2.1
Real Estate Management and Development	131,794		2.4		123,697		2.2
Road and Rail	35,106		0.6		35,801		0.6
Software	1,492,538		26.6		1,410,563		25.3
Specialty Retail	326,116		5.8		365,734		6.6
Technology Hardware, Storage and Peripherals	23,505		0.4		23,269		0.4
Textiles, Apparel and Luxury Goods	45,419		0.8		44,882		0.8
Trading Companies and Distributors	38,533		0.7		34,410		0.6
Water Utilities	18,141		0.3		17,822		0.3
Total	$	5,618,695	100.0	%	$	5,569,604	100.0	%

* Represents an amount less than 0.1%.

	As of March 31, 2023				As of September 30, 2022
Fair Value:
Aerospace and Defense	$	25,133	0.5	%	$	64,365	1.2	%
Airlines	922		0.0	*	926		0.0	*
Auto Components	40,011		0.7		41,026		0.8
Automobiles	265,011		4.8		260,506		4.8
Beverages	56,334		1.0		57,804		1.1
Biotechnology	1,210		0.0	*	1,536		0.0	*
Building Products	17,932		0.3		17,770		0.3
Chemicals	80,981		1.5		79,461		1.5
Commercial Services and Supplies	166,854		3.1		135,584		2.5
Communications Equipment	11,386		0.2		11,162		0.2
Containers and Packaging	45,418		0.8		44,198		0.8
Distributors	—		—		5,941		0.1
Diversified Consumer Services	253,626		4.6		236,896		4.3
Diversified Financial Services	38,713		0.7		26,928		0.5
Diversified Telecommunications Services	1,620		0.0	*	1,628		0.0	*
Electronic Equipment, Instruments and Components	24,639		0.5		138,011		2.5
Energy Equipment and Services	1,637		0.0	*	1,740		0.0	*
Food and Staples Retailing	56,139		1.0		84,744		1.6
Food Products	157,386		2.9		136,802		2.5
Healthcare Equipment and Supplies	133,912		2.5		131,962		2.4
Healthcare Providers and Services	444,666		8.1		444,736		8.2
Health Care Technology	219,062		4.0		200,658		3.7
Hotels, Restaurants and Leisure	137,865		2.5		134,159		2.5
Household Durables	6,343		0.1		9,275		0.2
Household Products	5,183		0.1		5,265		0.1
Industrial Conglomerates	38,028		0.7		30,407		0.6
Insurance	216,138		4.0		226,158		4.2
Internet and Catalog Retail	65,712		1.2		61,299		1.1
IT Services	254,630		4.7		249,240		4.6
Leisure Products	13,443		0.3		13,478		0.2
Life Sciences Tools & Services	72,407		1.3		49,478		0.9
Machinery	33,999		0.6		31,750		0.6
Marine	18,184		0.3		18,399		0.3
Media	6,275		0.1		6,503		0.1
Multiline Retail	45,138		0.8		45,138		0.8
Oil, Gas and Consumable Fuels	115,146		2.1		90,054		1.7
Paper and Forest Products	10,123		0.2		10,640		0.2
Personal Products	33,483		0.6		33,869		0.6
Pharmaceuticals	160,101		2.9		150,263		2.8
Professional Services	121,534		2.2		116,622		2.1
Real Estate Management and Development	128,689		2.4		119,120		2.2
Road and Rail	34,559		0.6		35,742		0.7
Software	1,482,865		27.0		1,401,424		25.7
Specialty Retail	322,520		5.9		367,521		6.7
Technology Hardware, Storage and Peripherals	22,376		0.4		22,852		0.4
Textiles, Apparel and Luxury Goods	44,408		0.8		42,302		0.8
Trading Companies and Distributors	37,667		0.7		33,597		0.6
Water Utilities	16,944		0.3		17,417		0.3
Total	$	5,486,352	100.0	%	$	5,446,356	100.0	%

* Represents an amount less than 0.1%.