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Significant Accounting and Reporting Policies - Additional Information (Detail) - JPY (¥) ¥ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Significant Accounting Policies [Line Items] |  |  |  |
A maximum lag period of recognizing the results of subsidiaries and affiliates |  | 3 months |  |
Residential condominiums under development |  | ¥ 74,621 | ¥ 62,414 |
Completed residential condominiums and merchandise for sale |  | 94,400 | 77,149 |
Write-downs on completed residential condominiums and merchandise for sale |  | 1,205 | 10,492 | ¥ 2,510
Accounting Standards Update 2018-12 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Increase (decrease) in policy liability and policy account balances | ¥ 29,000 | (234,000) | (51,000) |
Increase (decrease) in policy liability discount rate | ¥ (25,000) | 165,000 | 38,000 |
Increase (decrease) in other operating assets |  | 24,000 | 10,000 |
Increase (decrease) in life insurance costs |  | (25,000) | (5,000) |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Increase (decrease) in retained earnings |  | ¥ 23,000 | 6,000 |
Investment in operating leases | Transportation equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 5 years |  |
Investment in operating leases | Measuring and information-related equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 4 years |  |
Investment in operating leases | Real Estate Other Than Land |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 31 years |  |
Investment in operating leases | Other |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 8 years |  |
Property under Facility Operations |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciation expenses |  | ¥ 34,622 | 29,871 | 30,448
Accumulated depreciation |  | 180,130 | 147,459 |
Office Facilities |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciation expenses |  | 8,373 | 9,083 | ¥ 8,269
Accumulated depreciation |  | ¥ 74,507 | ¥ 73,063 |
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Income tax settlement by tax authority |  | 50.00% |  |
Maximum | Property under Facility Operations | Buildings |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 50 years |  |
Maximum | Property under Facility Operations | Structures |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 60 years |  |
Maximum | Property under Facility Operations | Property, Plant and Equipment, Other Types |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 44 years |  |
Maximum | Office Facilities | Buildings And Structures |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 62 years |  |
Maximum | Office Facilities | Machinery and equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives |  | 46 years |  |

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