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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Deferred Policy Acquisition Costs (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | ¥ 287,379 | ¥ 268,960
Capitalization | 14,569 | 31,202
Amortization | (8,979) | (16,320)
Effect of changes in foreign exchange rate | 5,440 | 3,537
Ending balance | 298,409 | 287,379
Yen-denominated insurance (First Sector) |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | 77,957 | 74,676
Capitalization | 3,937 | 8,682
Amortization | (2,917) | (5,401)
Effect of changes in foreign exchange rate | 0 | 0
Ending balance | 78,977 | 77,957
Yen-denominated insurance (Third Sector) |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | 166,696 | 159,041
Capitalization | 7,065 | 16,795
Amortization | (4,971) | (9,140)
Effect of changes in foreign exchange rate | 0 | 0
Ending balance | 168,790 | 166,696
Foreign currency denominated insurance |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Beginning balance | 42,726 | 35,243
Capitalization | 3,567 | 5,725
Amortization | (1,091) | (1,779)
Effect of changes in foreign exchange rate | 5,440 | 3,537
Ending balance | ¥ 50,642 | ¥ 42,726

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