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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income | ¥ 116,919 | ¥ 117,444 | ¥ 221,724 | ¥ 220,170
Liability for Future Policy Benefit, Interest Expense | 6,936 | 6,189 | 13,628 | 12,136
Yen-denominated insurance (First Sector) |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 38,306 | 37,775 | 74,702 | 73,383
Liability for Future Policy Benefit, Interest Expense | 3,263 | 3,049 | 6,484 | 6,047
Yen-denominated insurance (Third Sector) |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 51,362 | 51,906 | 102,734 | 103,314
Liability for Future Policy Benefit, Interest Expense | 2,406 | 2,258 | 4,763 | 4,465
Foreign currency denominated insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 27,251 | 27,763 | 44,288 | 43,473
Liability for Future Policy Benefit, Interest Expense | ¥ 1,267 | ¥ 882 | ¥ 2,381 | ¥ 1,624

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