CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022
Operating Activities
Net (decrease) increase in net assets resulting from operations	$ (92,439)	$ 212,131
Net realized (losses) on extinguishment of debt	28	5,357
Net realized losses on investments	23,177	601
Net change in unrealized losses (gains) on investments	168,500	(136,720)
Amortization of discounts (accretion of premiums), net	5,412	8,459
Accretion of original issue discount	767	573
Amortization of deferred financing costs	1,692	1,915
Interest Income Capitalized as PIK	(24,194)	(18,790)
Structuring fees	(4,225)	(11,360)
Change in operating assets and liabilities:
Payments for purchases of investments	(276,111)	(394,518)
Proceeds from sale of investments and collection of investment principal	127,286	323,399
Increase (decrease) in due to broker	2,834	(2,627)
Increase in due to Prospect Capital Management	1,847	3,338
Increase in interest receivable, net	(5,856)	(317)
Decrease in interest payable	(7,243)	(12,283)
Increase (decrease) in accrued expenses	1,466	(53)
Decrease in due from broker	0	12,551
Increase (Decrease) in other liabilities	297	(162)
Increase in other receivables	(564)	(44)
Increase in due from affiliate	0	(1)
Decrease in prepaid expenses	239	234
Increase (decrease) in due to Prospect Administration	188	(1,798)
Net Cash Used In Operating Activities	(76,899)	(10,115)
Financing Activities
Borrowings under Revolving Credit Facility (Note 4)	262,300	417,618
Principal payments under Revolving Credit Facility (Note 4)	(301,913)	(690,018)
Redemptions of Convertible Notes, net (Note 5)	(60,501)	(51,872)
Financing costs paid and deferred	(5,187)	(6,047)
Proceeds from issuance of preferred stock, net of underwriting costs	261,625	216,123
Offering costs from issuance of preferred stock	(4,353)	(1,360)
Dividends paid and distributions to stockholders	(68,176)	(64,034)
Net Cash Provided by (Used in) Financing Activities	84,934	(11,339)
Net Increase (Decrease) in Cash	8,035	(21,454)
Cash at beginning of period	35,364	63,610	$ 63,610
Cash at End of Period	43,399	42,156	$ 35,364
Supplemental Disclosures
Cash paid for interest	38,654	37,833
Non-Cash Financing Activities
Value of shares issued through reinvestment of dividends	15,477	8,339
Public Notes
Financing Activities
Issuance of debt	0	294,798
Redemptions of unsecured debt	(341)	0
Prospect Capital InterNotes
Financing Activities
Issuance of debt	2,624	87,657
Redemptions of unsecured debt	$ (1,144)	$ (214,204)