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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit, Weighted Average Duration (Detail) | Sep. 30, 2025 | Mar. 31, 2025
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Yen-denominated insurance (First Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for future policy benefit weighted average duration | 34 years 6 months | 35 years 1 month 6 days
Yen-denominated insurance (Third Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for future policy benefit weighted average duration | 31 years 7 months 6 days | 32 years 6 months
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for future policy benefit weighted average duration | 31 years 10 months 24 days | 33 years 6 months

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