Investments - Schedules of Portfolio Composition by Geographic Region at Amortization Cost and Fair Value (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Dec. 31, 2024 |
Sep. 30, 2024 |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 8,755,566
|
|
$ 8,302,913
|
|
| Fair Value |
8,685,231
|
[1] |
8,235,411
|
[2] |
| Banks |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
11,334
|
|
2,094
|
|
| Fair Value |
11,314
|
|
2,076
|
|
| Biotechnology |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
1,993
|
|
1,993
|
|
| Fair Value |
670
|
|
764
|
|
| Capital Markets |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
2,549
|
|
2,557
|
|
| Fair Value |
2,533
|
|
2,540
|
|
| Construction & Engineering |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
4,031
|
|
4,042
|
|
| Fair Value |
4,040
|
|
4,050
|
|
| Diversified Telecommunication Services |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
1,523
|
|
1,521
|
|
| Fair Value |
1,529
|
|
1,529
|
|
| Electrical Equipment |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
25,092
|
|
1,406
|
|
| Fair Value |
$ 25,104
|
|
$ 1,425
|
|
| Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
100.00%
|
|
100.00%
|
|
| Amortized Cost | Industry Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
100.00%
|
|
100.00%
|
|
| Amortized Cost | Industry Concentration Risk | Banks |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.10%
|
|
0.00%
|
|
| Amortized Cost | Industry Concentration Risk | Biotechnology |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Amortized Cost | Industry Concentration Risk | Capital Markets |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Amortized Cost | Industry Concentration Risk | Construction & Engineering |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.10%
|
|
| Amortized Cost | Industry Concentration Risk | Diversified Telecommunication Services |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Amortized Cost | Industry Concentration Risk | Electrical Equipment |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.30%
|
|
0.00%
|
|
| Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
100.00%
|
|
100.00%
|
|
| Fair Value | Industry Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
100.00%
|
|
100.00%
|
|
| Fair Value | Industry Concentration Risk | Banks |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.10%
|
|
0.00%
|
|
| Fair Value | Industry Concentration Risk | Biotechnology |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Fair Value | Industry Concentration Risk | Capital Markets |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Fair Value | Industry Concentration Risk | Construction & Engineering |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Fair Value | Industry Concentration Risk | Diversified Telecommunication Services |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Fair Value | Industry Concentration Risk | Electrical Equipment |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.30%
|
|
0.00%
|
|
| Mid-Atlantic |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 1,640,965
|
|
$ 1,502,136
|
|
| Fair Value |
$ 1,652,333
|
|
$ 1,506,726
|
|
| Mid-Atlantic | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
18.70%
|
|
18.10%
|
|
| Mid-Atlantic | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
19.00%
|
|
18.30%
|
|
| Midwest |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 1,386,094
|
|
$ 1,391,538
|
|
| Fair Value |
$ 1,367,958
|
|
$ 1,352,353
|
|
| Midwest | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
15.80%
|
|
16.80%
|
|
| Midwest | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
15.80%
|
|
16.40%
|
|
| West |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 1,309,131
|
|
$ 1,133,878
|
|
| Fair Value |
$ 1,309,619
|
|
$ 1,130,497
|
|
| West | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
15.00%
|
|
13.70%
|
|
| West | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
15.10%
|
|
13.70%
|
|
| Southeast |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 1,694,324
|
|
$ 1,638,221
|
|
| Fair Value |
$ 1,675,140
|
|
$ 1,634,599
|
|
| Southeast | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
19.40%
|
|
19.70%
|
|
| Southeast | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
19.30%
|
|
19.80%
|
|
| Southwest |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 1,114,761
|
|
$ 1,041,814
|
|
| Fair Value |
$ 1,101,557
|
|
$ 1,020,950
|
|
| Southwest | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
12.70%
|
|
12.50%
|
|
| Southwest | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
12.70%
|
|
12.40%
|
|
| Northeast |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 737,414
|
|
$ 713,024
|
|
| Fair Value |
$ 739,290
|
|
$ 713,123
|
|
| Northeast | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
8.40%
|
|
8.60%
|
|
| Northeast | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
8.50%
|
|
8.70%
|
|
| Canada |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 169,995
|
|
$ 182,002
|
|
| Fair Value |
$ 160,542
|
|
$ 178,003
|
|
| Canada | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
1.90%
|
|
2.20%
|
|
| Canada | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
1.80%
|
|
2.20%
|
|
| United Kingdom |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 327,130
|
|
$ 395,769
|
|
| Fair Value |
$ 315,881
|
|
$ 395,840
|
|
| United Kingdom | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
3.70%
|
|
4.80%
|
|
| United Kingdom | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
3.60%
|
|
4.80%
|
|
| Australia |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 20,042
|
|
$ 20,909
|
|
| Fair Value |
$ 17,281
|
|
$ 20,113
|
|
| Australia | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.20%
|
|
0.20%
|
|
| Australia | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.20%
|
|
0.20%
|
|
| Luxembourg |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 65,364
|
|
$ 58,328
|
|
| Fair Value |
$ 64,141
|
|
$ 57,439
|
|
| Luxembourg | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.80%
|
|
0.70%
|
|
| Luxembourg | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.70%
|
|
0.70%
|
|
| Netherlands |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 96,172
|
|
$ 95,950
|
|
| Fair Value |
$ 89,822
|
|
$ 89,708
|
|
| Netherlands | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
1.10%
|
|
1.20%
|
|
| Netherlands | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
1.00%
|
|
1.10%
|
|
| Finland |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 79,360
|
|
$ 52,670
|
|
| Fair Value |
$ 78,994
|
|
$ 56,608
|
|
| Finland | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.90%
|
|
0.60%
|
|
| Finland | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.90%
|
|
0.70%
|
|
| Sweden |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 33,708
|
|
$ 33,243
|
|
| Fair Value |
$ 33,317
|
|
$ 34,709
|
|
| Sweden | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.40%
|
|
0.40%
|
|
| Sweden | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.40%
|
|
0.40%
|
|
| Israel |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 855
|
|
$ 855
|
|
| Fair Value |
$ 1,051
|
|
$ 1,008
|
|
| Israel | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Israel | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Denmark |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 4,862
|
|
$ 4,860
|
|
| Fair Value |
$ 4,906
|
|
$ 4,896
|
|
| Denmark | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.10%
|
|
0.10%
|
|
| Denmark | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.10%
|
|
0.10%
|
|
| Germany |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 57,508
|
|
$ 19,896
|
|
| Fair Value |
$ 56,186
|
|
$ 20,493
|
|
| Germany | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.70%
|
|
0.20%
|
|
| Germany | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.70%
|
|
0.30%
|
|
| France |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 17,881
|
|
$ 17,820
|
|
| Fair Value |
$ 17,272
|
|
$ 18,346
|
|
| France | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.20%
|
|
0.20%
|
|
| France | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.20%
|
|
0.20%
|
|
| Jersey |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Amortized Cost |
$ 0
|
|
$ 0
|
|
| Fair Value |
$ (59)
|
|
$ 0
|
|
| Jersey | Amortized Cost | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
| Jersey | Fair Value | Geographic Concentration Risk |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Concentration risk, percentage |
0.00%
|
|
0.00%
|
|
|
|