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v3.23.3

Significant Accounting and Reporting Policies - Additional Information (Detail) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Apr. 01, 2021
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
A maximum lag period of recognizing the results of subsidiaries and affiliates |  |  | 3 months |  |  |  |
Effective tax rate | 30.10% | 23.30% | 29.20% | 24.10% |  |  |
National corporation tax | 24.00% | 24.00% | 24.00% | 24.00% |  |  |
Inhabitant tax | 4.00% | 4.00% | 4.00% | 4.00% |  |  |
Deductible enterprise tax | 4.00% | 4.00% | 4.00% | 4.00% |  |  |
Statutory income tax rate | 31.50% | 31.50% | 31.50% | 31.50% |  |  |
Loans held for sale in installment loans | ¥ 158,990 |  | ¥ 158,990 |  | ¥ 201,355 |  |
Aggregate loan fair value | 149,390 |  | 149,390 |  | 197,041 |  |
Residential condominiums under development | 133,790 |  | 133,790 |  | 74,621 |  |
Finished goods | 89,117 |  | 89,117 |  | 94,400 |  |
Write-down on residential condominiums under development | 862 | ¥ 21 | 1,130 | ¥ 508 |  |  |
Goodwill acquired | 659,323 |  | 659,323 |  | 627,683 |  |
Other intangible assets | 545,893 |  | 545,893 |  | 518,142 |  |
Increase (decrease) in policy liability and policy account balances | 1,783,074 |  | 1,783,074 |  | 1,832,057 |  |
Increase (decrease) in impact of changes in policy liability discount rate | 326,700 |  | 326,700 |  | 156,135 |  |
Increase (decrease) in other operating assets | 298,409 |  | 298,409 |  | 287,379 | ¥ 268,960 |
Increase (decrease) in life insurance costs | 102,377 | ¥ 119,698 | 222,097 | ¥ 220,715 |  |  |
Increase (decrease) in retained earnings | 3,132,339 |  | 3,132,339 |  | 3,054,448 |  |
Accounting Standards Update 2018-12 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase (decrease) in policy liability and policy account balances |  |  |  |  | (233,309) | (50,925) | ¥ 28,937
Increase (decrease) in impact of changes in policy liability discount rate |  |  |  |  | 164,516 | 37,535 | ¥ (24,641)
Increase (decrease) in other operating assets |  |  |  |  | 23,194 | 10,012 |
Increase (decrease) in life insurance costs |  |  |  |  | (25,010) | (4,571) |
Increase (decrease) in retained earnings |  |  |  |  | 22,506 | ¥ 5,241 |
Investment in operating leases |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Accumulated depreciation of Investment in operating leases | 918,100 |  | 918,100 |  | 865,942 |  |
Property under Facility Operations |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Accumulated depreciation | 197,297 |  | 197,297 |  | 180,130 |  |
Office Facilities |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Accumulated depreciation | ¥ 79,463 |  | ¥ 79,463 |  | ¥ 74,507 |  |
Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Income tax settlement by tax authority |  |  | 50.00% |  |  |  |

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