Investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands		Mar. 31, 2026		Dec. 31, 2025		Sep. 30, 2025
Other Investments
Fair Value		$ 254,123		$ 253,152
Other Long-term Investments
Other Investments
Cost or adjusted/amortized cost		39,109		38,954
Unrealized Gain		2,575		1,106
Unrealized Loss		26		7
Fair Value		41,658		40,053
Real Estate Management LLC
Other Investments
Cost or adjusted/amortized cost		2,002		2,000
Unrealized Gain		0		0
Unrealized Loss		0		0
Fair Value		2,002		2,000
Other Investments
Other Investments
Fair Value		22,301
Limited Partnership
Other Investments
Cost or adjusted/amortized cost	[1]	3,007		3,024
Unrealized Gain	[1]	1,508		1,093
Unrealized Loss	[1]	0		0
Fair Value of Limited Partnership Interest	[1]	4,515		4,117
Surplus Note
Other Investments
Cost or adjusted/amortized cost	[1]	6,000		6,000
Unrealized Gain	[1]	0		0
Unrealized Loss	[1]	0		0
Fair Value		6,000	[1]	6,000	[1]	$ 6,000
Warrants
Other Investments
Cost or adjusted/amortized cost		0
Unrealized Gain		1,064
Unrealized Loss		0
Fair Value		1,064
Commercial Mortgage Loans
Other Investments
Cost or adjusted/amortized cost		6,840		6,840
Unrealized Gain		0		0
Unrealized Loss		0		0
Fair Value		6,840		6,840
Short-term Investments
Other Investments
Cost or adjusted/amortized cost		21,260		21,090
Unrealized Gain		3		13
Unrealized Loss		26		7
Fair Value		$ 21,237		$ 21,096

[1] Distributions will be generated from operating income, investment gains, underlying investments of funds, and from liquidation of the underlying assets of the funds. The Company estimates that the underlying assets of the funds will be liquidated over the next four to seven years.