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v3.25.3

Investment in Securities - Additional Information (Detail) ¥ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2025 JPY (¥) Investment | Sep. 30, 2024 JPY (¥) | Mar. 31, 2025 JPY (¥) Investment
Schedule of Investments [Line Items] |  |  |
Net unrealized holding gains (losses) on trading securities | ¥ 64,276 | ¥ (1,992) |
Investment funds fair value | ¥ 41,499 |  | ¥ 41,018
Number of investment securities in an unrealized loss position | Investment | 1,113 |  | 1,272
Debt securities available-for-sale accrued interest, after allowance for credit loss | ¥ 14,761 |  | ¥ 14,545
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other Assets |  |
Net unrealized holding gains (losses) on trading debt securities held | ¥ 5 |  |
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 24,488 |  | 24,960
Available-for-sale securities | Foreign Government Bond Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | 5,335 |  | 5,379
Available-for-sale securities | Foreign Corporate Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment funds fair value | ¥ 11,676 |  | ¥ 10,679

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