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Policyholders' Liabilities - Guaranteed Minimum Crediting Rate (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance $ 245,619 $ 222,009
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance $ 34,230 $ 36,314
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149 | Minimum [Member]    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Range of Guaranteed Minimum Crediting Rates: 0.00% 0.00%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149 | Maximum [Member]    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Range of Guaranteed Minimum Crediting Rates: 1.49% 1.49%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance $ 39,409 $ 36,145
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299 | Minimum [Member]    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Range of Guaranteed Minimum Crediting Rates: 1.50% 1.50%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299 | Maximum [Member]    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Range of Guaranteed Minimum Crediting Rates: 2.99% 2.99%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance $ 140,726 $ 118,031
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449 | Minimum [Member]    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Range of Guaranteed Minimum Crediting Rates: 3.00% 3.00%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449 | Maximum [Member]    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Range of Guaranteed Minimum Crediting Rates: 4.49% 4.49%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Range of Guaranteed Minimum Crediting Rates: 4.50% 4.50%
Policyholder Account Balance $ 31,254 $ 31,519
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 149,416 142,821
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 870 816
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 3,916 8,840
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 113,376 101,646
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 31,254 31,519
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 564 522
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 0 0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 179 176
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 385 346
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 0 0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 26,971 16,802
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 0 726
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 6 37
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 26,965 16,039
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 0 0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 68,668 61,864
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 33,360 34,772
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 35,308 27,092
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance 0 0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder Account Balance $ 0 $ 0