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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit, Weighted Average Discount Rates (Detail) | Sep. 30, 2025 | Mar. 31, 2025
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Yen-denominated insurance (First Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted average of the original discount rates | 1.80% | 1.80%
Weighted average of the current discount rates | 4.50% | 2.70%
Yen-denominated insurance (Third Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted average of the original discount rates | 1.70% | 1.70%
Weighted average of the current discount rates | 4.50% | 2.70%
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted average of the original discount rates | 3.40% | 3.30%
Weighted average of the current discount rates | 5.70% | 5.90%

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