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v3.25.3

Significant Accounting and Reporting Policies - Additional Information (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Significant Accounting Policies [Line Items] |  |  |
A maximum lag period of recognizing the results of subsidiaries and affiliates | 3 months |  |
Residential condominiums under development | ¥ 122,566 |  | ¥ 116,416
Finished goods | ¥ 117,811 |  | 112,813
Effective tax rate | 29.80% | 29.10% |
National corporation tax | 24.00% | 24.00% |
Inhabitant tax | 2.00% | 2.00% |
Statutory income tax rate | 31.50% | 31.50% |
Deductible enterprise tax | 5.00% | 5.00% |
Loans held for sale in installment loans | ¥ 95,050 |  | 111,527
Goodwill acquired | 783,996 |  | 621,858
Other intangible assets | 551,157 |  | 525,411
Aggregate loan fair value | 85,724 |  | 97,694
Investment in operating leases |  |  |
Significant Accounting Policies [Line Items] |  |  |
Accumulated depreciation of Investment in operating leases | 981,454 |  | 946,341
Property under Facility Operations |  |  |
Significant Accounting Policies [Line Items] |  |  |
Accumulated depreciation | 245,560 |  | 238,185
Office Facilities |  |  |
Significant Accounting Policies [Line Items] |  |  |
Accumulated depreciation | ¥ 67,666 |  | ¥ 65,155

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