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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
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- Definition Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(14)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A + Details
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