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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, 2025 | Mar. 31, 2025
Deferred Policy Acquisition Cost [Line Items] |  |  |
Beginning balance |  | ¥ 315,840 | ¥ 305,734
Capitalization |  | 19,007 | 35,871
Amortization |  | (10,049) | (19,215)
Effect of changes in foreign exchange rate |  | 5,650 | (742)
Others | [1] | (9,943) | (5,808)
Ending balance |  | 320,505 | 315,840
Yen-denominated insurance (First Sector) |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Beginning balance |  | 89,361 | 82,341
Capitalization |  | 7,085 | 13,431
Amortization |  | (3,421) | (6,411)
Effect of changes in foreign exchange rate |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 93,025 | 89,361
Yen-denominated insurance (Third Sector) |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Beginning balance |  | 168,689 | 169,581
Capitalization |  | 3,923 | 9,180
Amortization |  | (5,040) | (10,072)
Effect of changes in foreign exchange rate |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 167,572 | 168,689
Foreign currency denominated insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Beginning balance |  | 57,151 | 53,812
Capitalization |  | 3,206 | 6,633
Amortization |  | (1,371) | (2,689)
Effect of changes in foreign exchange rate |  | (203) | (605)
Others | [1] | 0 | 0
Ending balance |  | 58,783 | 57,151
Single- payment whole life insurance |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |
Beginning balance |  | 639 | 0
Capitalization |  | 4,793 | 6,627
Amortization |  | (217) | (43)
Effect of changes in foreign exchange rate |  | 5,853 | (137)
Others | [1] | (9,943) | (5,808)
Ending balance |  | ¥ 1,125 | ¥ 639
[1] | Others include adjustments of reinsurance.

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