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v3.25.2

Investment in Securities - Additional Information (Detail) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 JPY (¥) Investment | Mar. 31, 2024 JPY (¥) Investment | Mar. 31, 2023 JPY (¥)
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gains (losses) on trading securities | ¥ 4,422 | ¥ 53,318 | ¥ 18,065
Proceeds from sales of available-for-sale debt securities | 299,890 | 215,674 | 323,773
Available-for-sale debt securities gross realized gains | 8,499 | 4,137 | 7,757
Available-for-sale debt securities gross realized losses | 16,517 | 11,090 | 8,367
Investment funds fair value | ¥ 41,018 | ¥ 35,696 |
Number of investment securities in an unrealized loss position | Investment | 1,272 | 1,126 |
Allowance for credit losses for accrued interest receivables | ¥ 14,545 | ¥ 13,960 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |
Finance revenues | ¥ 29,140 | 26,331 | 19,906
Accrued Interest Receivables |  |  |
Schedule of Investments [Line Items] |  |  |
Allowance for credit losses for accrued interest receivables | 0 | 0 |
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 24,960 | 26,945 |
Trading Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gains (losses) on trading debt securities | 0 | (96) | ¥ (469)
Available-for-sale securities | Foreign Government Bond Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 5,379 | 1,000 |
Available-for-sale securities | Foreign Corporate Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | ¥ 10,679 | ¥ 7,751 |

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