Common Stock Transactions - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended							12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	May 31, 2025	Apr. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Aug. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Aug. 01, 2025	May 16, 2025	Feb. 21, 2025	Feb. 20, 2025	Aug. 02, 2024	Oct. 06, 2023
Subsidiary or Equity Method Investee [Line Items]
Common stock, par value (in dollars per share)	$ 0.001					$ 0.001		$ 0.001	$ 0.001				$ 0.001			$ 0.001
Offering costs, partnership interests												$ 288,043
Stock repurchase program, authorized amount											$ 150,000				$ 150,000
Stock repurchased during period, shares (in shares)	368,333	11,200	158,199	2,285,299	77,777	9,400	322,528	2,900,808	331,928
Average price paid per share (in dollars per share)	$ 14.02	$ 14.29	$ 14.27	$ 13.97	$ 14.53	$ 14.54	$ 14.48	$ 14.01	$ 14.49
Approximate dollar value of shares that have been purchased under the plan	$ 5,165	$ 160	$ 2,258	$ 31,918	$ 1,130	$ 137	$ 4,672	$ 40,631	$ 4,809	$ 16,861
Capital stocks, authorized (in shares)													501,000,000	351,000,000
Common stock, shares authorized (in shares)	500,000,000					350,000,000		500,000,000	350,000,000				500,000,000
Preferred stock, shares authorized (in shares)	1,000,000					1,000,000		1,000,000	1,000,000				1,000,000
Preferred stock, par value (in dollars per share)	$ 0.001					$ 0.001		$ 0.001	$ 0.001				$ 0.001
Other Receivables
Subsidiary or Equity Method Investee [Line Items]
Stock repurchased during period, shares (in shares)								200,000
Average price paid per share (in dollars per share)								$ 13.74
Approximate dollar value of shares that have been purchased under the plan								$ 2,748