Dividends and Distributions - Summary of Dividends Declarations and Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Dividends Payable [Line Items]
Cash Distribution	$ 361,779	$ 372,959	$ 238,392
O 2025 M2 1 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)	$ 0.05
Cash Distribution	$ 10,760
DRIP shares issued (in shares)	0
DRIP Shares Value	$ 2,454
DRIP shares purchase (in shares)	162,709
DRIP shares purchase, weighted average exercised price per share (in dollars per share)	$ 15.08
O 2025 M2 2 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)	$ 0.04
Cash Distribution	$ 8,607
DRIP shares issued (in shares)	0
DRIP Shares Value	$ 1,964
DRIP shares purchase (in shares)	130,168
DRIP shares purchase, weighted average exercised price per share (in dollars per share)	$ 15.08
O 2025 M3 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)	$ 0.39
Cash Distribution	$ 84,514
DRIP shares issued (in shares)	1,221,469
DRIP Shares Value	$ 18,554
O 2025 M6 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)	$ 0.39
Cash Distribution	$ 89,334
DRIP shares issued (in shares)	1,001,354
DRIP Shares Value	$ 15,150
O 2025 M9 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)	$ 0.39
Cash Distribution	$ 87,755
DRIP shares issued (in shares)	0
DRIP Shares Value	$ 16,136
DRIP shares purchase (in shares)	1,094,965
DRIP shares purchase, weighted average exercised price per share (in dollars per share)	$ 14.74
O 2025 M12 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)	$ 0.39
Cash Distribution	$ 87,238
DRIP shares issued (in shares)	0
DRIP Shares Value	$ 16,649
DRIP shares purchase (in shares)	1,217,370
DRIP shares purchase, weighted average exercised price per share (in dollars per share)	$ 13.68
O 2024 M3 1 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.07
Cash Distribution		$ 9,584
DRIP shares issued (in shares)		152,288
DRIP Shares Value		$ 2,287
O 2024 M3 2 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.37
Cash Distribution		$ 50,152
DRIP shares issued (in shares)		838,765
DRIP Shares Value		$ 12,599
O 2024 M5 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.07
Cash Distribution		$ 9,906
DRIP shares issued (in shares)		134,135
DRIP Shares Value		$ 2,035
O 2024 M6 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.39
Cash Distribution		$ 53,930
DRIP shares issued (in shares)		797,377
DRIP Shares Value		$ 12,599
O 2024 M 8 1 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.39
Cash Distribution		$ 55,368
DRIP shares issued (in shares)		762,152
DRIP Shares Value		$ 11,524
O 2024 M 8 2 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.06
Cash Distribution		$ 8,572
DRIP shares issued (in shares)		113,668
DRIP Shares Value		$ 1,718
O 2024 M 9 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.05
Cash Distribution		$ 11,661
DRIP shares issued (in shares)		100,621
DRIP Shares Value		$ 1,521
O 2024 M 11 1 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.05
Cash Distribution		$ 10,652
DRIP shares issued (in shares)		0
DRIP Shares Value		$ 2,563
DRIP shares purchase (in shares)		339,804
DRIP shares purchase, weighted average exercised price per share (in dollars per share)		$ 15.08
O 2024 M 11 2 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.05
Cash Distribution		$ 10,652
DRIP shares issued (in shares)		0
DRIP Shares Value		$ 2,563
O 2024 M 11 3 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)		$ 0.39
Cash Distribution		$ 82,973
DRIP shares issued (in shares)		0
DRIP Shares Value		$ 20,099
DRIP shares purchase (in shares)		1,330,990
DRIP shares purchase, weighted average exercised price per share (in dollars per share)		$ 15.10
O 2023 M3 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)			$ 0.33
Cash Distribution			$ 47,245
DRIP shares issued (in shares)			0
DRIP Shares Value			$ 9,151
DRIP shares purchase (in shares)			689,422
DRIP shares purchase, weighted average exercised price per share (in dollars per share)			$ 13.27
O 2023 M 6 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)			$ 0.33
Cash Distribution			$ 43,548
DRIP shares issued (in shares)			0
DRIP Shares Value			$ 12,848
DRIP shares purchase (in shares)			959,844
DRIP shares purchase, weighted average exercised price per share (in dollars per share)			$ 13.39
O 2023 M 9 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)			$ 0.33
Cash Distribution			$ 44,518
DRIP shares issued (in shares)			0
DRIP Shares Value			$ 11,548
DRIP shares purchase (in shares)			854,808
DRIP shares purchase, weighted average exercised price per share (in dollars per share)			$ 13.51
O 2023 M 11 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)			$ 0.04
Cash Distribution			$ 5,495
DRIP shares issued (in shares)			0
DRIP Shares Value			$ 1,289
DRIP shares purchase (in shares)			90,264
DRIP shares purchase, weighted average exercised price per share (in dollars per share)			$ 14.28
O 2023 M 12 Dividends
Dividends Payable [Line Items]
Amount per share (in dollars per share)			$ 0.37
Cash Distribution			$ 50,659
DRIP shares issued (in shares)			0
DRIP Shares Value			$ 12,091
DRIP shares purchase (in shares)			824,353
DRIP shares purchase, weighted average exercised price per share (in dollars per share)			$ 14.67