Consolidated Statements of Assets and Liabilities (Parenthetical and Net Asset Value per Share) - USD ($) $ in Thousands	Sep. 30, 2025		Jun. 30, 2025	Dec. 31, 2024		Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments, amortized cost	$ 3,906,977	[1],[2],[3]		$ 3,159,171	[4],[5],[6]
Restricted cash	$ 68,451			$ 71,863		$ 38,952
Common shares, par value (in usd per share)	$ 0.001			$ 0.001
Common shares, issued (in shares)	84,687,951			60,925,719
Common shares, outstanding (in shares)	84,687,951			60,925,719
Net assets	$ 2,129,736		$ 1,914,655	$ 1,541,232		$ 1,418,657	$ 1,281,167	$ 798,851
Net asset value per share (in usd per share)	$ 25.15			$ 25.30
Common Class I
Common shares, par value (in usd per share)	$ 0.001			$ 0.001					$ 0.001
Common shares, issued (in shares)	75,114,570			57,123,580
Common shares, outstanding (in shares)	75,114,570			57,123,580		52,561,994
Net asset value per share (in usd per share)	$ 25.15			$ 25.30		$ 25.47		$ 25.41
Common Class I | Common Stock
Net assets	$ 1,888,984			$ 1,445,050		$ 1,338,930
Common Class S
Common shares, par value (in usd per share)	$ 0.001			$ 0.001					0.001
Common shares, issued (in shares)	9,468,129			3,729,761
Common shares, outstanding (in shares)	9,468,129			3,729,761		3,084,929
Net asset value per share (in usd per share)	$ 25.15			$ 25.30		$ 25.47		25.41
Common Class S | Common Stock
Net assets	$ 238,105			$ 94,351		$ 78,583
Common Class D
Common shares, par value (in usd per share)	$ 0.001			$ 0.001					$ 0.001
Common shares, issued (in shares)	105,252			72,378
Common shares, outstanding (in shares)	105,252			72,378		44,892
Net asset value per share (in usd per share)	$ 25.15			$ 25.30		$ 25.47		$ 25.41
Common Class D | Common Stock
Net assets	$ 2,647			$ 1,831		$ 1,144
Non-controlled/non-affiliated
Investments, amortized cost	3,821,388	[1]		3,084,619	[4]
Non-controlled/affiliated
Investments, amortized cost	$ 85,589	[1]		$ 74,552	[4]

[1] The amortized cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.

[2] Unless otherwise indicated, all investments represent co-investments made with the Company’s affiliates in accordance with the terms of the exemptive relief that the Company received from the U.S. Securities and Exchange Commission. Refer to Note 6 for further information.

[3] Unless otherwise indicated, all investments are considered Level 3 investments.

[4] The amortized cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.

[5] Unless otherwise indicated, all investments represent co-investments made with the Company’s affiliates in accordance with the terms of the exemptive relief that the Company received from the U.S. Securities and Exchange Commission. Refer to Note 6 for further information.

[6] Unless otherwise indicated, all investments are considered Level 3 investments.