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Significant Accounting and Reporting Policies - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Significant Accounting Policies [Line Items] |  |  |
A maximum lag period of recognizing the results of subsidiaries and affiliates | 3 months |  |
Residential condominiums under development | ¥ 116,416 | ¥ 118,458 |
Finished goods | 112,813 | 108,901 |
Increase (decrease) in retained earnings | 3,354,911 | 3,259,730 |
Other assets | 2,226,849 | 2,068,768 |
Accounting Standards Update 2023-02 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Increase (decrease) in retained earnings | (157) |  |
Other assets | ¥ (157) |  |
Investment in operating leases | Transportation equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated average useful lives | 7 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 | 29 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 | ¥ 41,671 | 35,615 | ¥ 34,622
Accumulated depreciation | 238,185 | 205,320 |
Office Facilities |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciation expenses | 9,842 | 9,256 | ¥ 8,373
Accumulated depreciation | ¥ 65,155 | ¥ 84,364 |
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Income tax settlement by tax authority | 50.00% |  |
Minimum | Investment in Corporate Entities |  |  |
Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 20.00% |  |
Minimum | Investments in Partnerships and Other Investments |  |  |
Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 3.00% |  |
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 |  |
Maximum | Investment in Corporate Entities |  |  |
Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Maximum | Investments in Partnerships and Other Investments |  |  |
Significant Accounting Policies [Line Items] |  |  |
Equity method investment, ownership percentage | 5.00% |  |

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