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Fair Value Measurements (Information about Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level Three Assets Measured at Fair Value on Nonrecurring Basis) (Detail) - Fair Value, Measurements, Nonrecurring ¥ in Millions | Mar. 31, 2024 JPY (¥) | Mar. 31, 2023 JPY (¥)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | ¥ 5,535 | ¥ 5,970
Investment in operating leases, property under facility operations, office facilities and other assets | 1,205 | 4,568
Certain equity method investments | 461 | 4,013
Assets measured at fair value on a nonrecurring basis | 27,391 | 27,484
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | 5,274 | 5,970
Investment in operating leases, property under facility operations, office facilities and other assets | 1,205 | 4,537
Certain equity method investments | 461 | 426
Assets measured at fair value on a nonrecurring basis | 6,940 | 10,933
Real Estate Collateral Dependent Loans | Level 3 | Direct capitalization |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | 892 | 1,351
Real Estate Collateral Dependent Loans | Level 3 | Appraisals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | ¥ 4,382 | ¥ 4,619
Real Estate Collateral Dependent Loans | Level 3 | Minimum | Direct capitalization | Capitalization rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Real estate collateral-dependent loans (net of allowance for credit losses) | 0.046 | 0.047
Real Estate Collateral Dependent Loans | Level 3 | Maximum | Direct capitalization | Capitalization rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Real estate collateral-dependent loans (net of allowance for credit losses) | 0.063 | 0.066
Real Estate Collateral Dependent Loans | Level 3 | Weighted Average | Direct capitalization | Capitalization rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Real estate collateral-dependent loans (net of allowance for credit losses) | 0.053 | 0.055
Investment in operating leases and property under facility operations | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in operating leases and property under facility operations | ¥ 337 |
Investment in operating leases and property under facility operations | Level 3 | Appraisals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in operating leases and property under facility operations | ¥ 868 |
Investment in operating leases and property under facility operations | Level 3 | Minimum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations | 0 |
Investment in operating leases and property under facility operations | Level 3 | Maximum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations | 0.13 |
Investment in operating leases and property under facility operations | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations | 0.036 |
Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in operating leases, property under facility operations, office facilities and other assets |  | ¥ 3,257
Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Appraisals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in operating leases, property under facility operations, office facilities and other assets |  | ¥ 1,280
Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Minimum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations, office facilities and other assets |  | 0.005
Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Maximum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations, office facilities and other assets |  | 0.058
Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations, office facilities and other assets |  | 0.049
Certain equity method investments | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain equity method investments |  | ¥ 23
Certain equity method investments | Level 3 | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments |  | 0.037
Certain equity method investments | Level 3 | Appraisals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain equity method investments |  | ¥ 403
Certain equity method investments | Level 3 | Market Multiples |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain equity method investments | ¥ 461 |
Certain equity method investments | Level 3 | Minimum | Market Multiples | EV/EBITDA multiple |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments | 3 |
Certain equity method investments | Level 3 | Maximum | Market Multiples | EV/EBITDA multiple |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments | 6 |
Certain equity method investments | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments |  | 0.037
Certain equity method investments | Level 3 | Weighted Average | Market Multiples | EV/EBITDA multiple |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments | 4.5 |

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