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Investment in Securities - Additional Information (Detail) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 JPY (¥) Investment | Mar. 31, 2023 JPY (¥) Investment | Mar. 31, 2022 JPY (¥)
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gains (losses) on trading securities | ¥ 53,318 | ¥ 18,065 | ¥ 26,075
Proceeds from sales of available-for-sale debt securities | 215,674 | 323,773 | 239,250
Available-for-sale debt securities gross realized gains | 4,137 | 7,757 | 6,493
Available-for-sale debt securities gross realized losses | 11,090 | 8,367 | 1,236
Investment funds fair value | ¥ 35,696 | ¥ 25,386 |
Number of investment securities in an unrealized loss position | Investment | 1,126 | 1,208 |
Debt securities available-for-sale accrued interest, after allowance for credit loss | ¥ 13,960 | ¥ 10,781 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |
Finance revenues | ¥ 26,331 | 19,906 | 12,737
Accrued Interest Receivables |  |  |
Schedule of Investments [Line Items] |  |  |
Debt securities available-for-sale accrued interest, after allowance for credit loss | 0 |  |
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 26,945 | 18,544 |
Trading Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gains (losses) on trading debt securities | (96) | (469) | ¥ 213
Available-for-sale securities | Foreign Government Bond Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 1,000 | 237 |
Available-for-sale securities | Foreign Corporate Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | ¥ 7,751 | ¥ 6,605 |

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