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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 | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | ¥ 471,859 | ¥ 456,924 | ¥ 448,676
Liability for Future Policy Benefit, Interest Expense | 31,466 | 28,105 | 24,971
Yen-denominated insurance (First Sector) |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 184,650 | 168,805 | 162,667
Liability for Future Policy Benefit, Interest Expense | 13,895 | 13,142 | 12,309
Yen-denominated insurance (Third Sector) |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 199,809 | 205,787 | 208,640
Liability for Future Policy Benefit, Interest Expense | 10,509 | 9,720 | 9,077
Foreign currency denominated insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 87,400 | 82,332 | 77,369
Liability for Future Policy Benefit, Interest Expense | ¥ 7,062 | ¥ 5,243 | ¥ 3,585

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