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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Minimum Guaranteed Interest Rates (Detail) - Fixed Annuity - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
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Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | ¥ 110,259 | ¥ 119,093
50-150bp |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 15,861 | 7,421
150bp and above |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 222,476 | 127,151
0.00% – less than 1.50% |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 102,794 | 111,626
0.00% – less than 1.50% | 50-150bp |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 15,861 | 7,421
0.00% – less than 1.50% | 150bp and above |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 222,476 | 127,151
1.50% or more |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 7,465 | 7,467
1.50% or more | 50-150bp |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 0 | 0
1.50% or more | 150bp and above |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | ¥ 0 | ¥ 0

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