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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Minimum Guaranteed Interest Rates (Parenthetical) (Detail) - Fixed Annuity | Sep. 30, 2025 | Mar. 31, 2025
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Minimum | 0.00% – less than 1.50% |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policyholder account balance guaranteed minimum credit rating | 0.00% | 0.00%
Minimum | 1.50% or more |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policyholder account balance guaranteed minimum credit rating | 1.50% | 1.50%
Maximum | 0.00% – less than 1.50% |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policyholder account balance guaranteed minimum credit rating | 1.50% | 1.50%

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