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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit Gross Premiums And Interest Expense (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Gross Premium Income | ¥ 233,136 | ¥ 228,564
Liability for Future Policy Benefit, Interest Expense | 16,824 | 15,348
Yen-denominated insurance (First Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Gross Premium Income | 89,337 | 81,607
Liability for Future Policy Benefit, Interest Expense | 7,289 | 6,856
Yen-denominated insurance (Third Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Gross Premium Income | 96,721 | 99,898
Liability for Future Policy Benefit, Interest Expense | 5,543 | 5,163
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Gross Premium Income | 47,078 | 47,059
Liability for Future Policy Benefit, Interest Expense | ¥ 3,992 | ¥ 3,329

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