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v3.23.3

Investment in Securities - Additional Information (Detail) ¥ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 JPY (¥) Investment | Sep. 30, 2022 JPY (¥) | Sep. 30, 2023 JPY (¥) Investment | Sep. 30, 2022 JPY (¥) | Mar. 31, 2023 JPY (¥) Investment
Schedule of Investments [Line Items] |  |  |  |  |
Net unrealized holding gains (losses) on trading securities | ¥ 1,178 | ¥ (949) | ¥ 24,322 | ¥ (15,645) |
Investment funds fair value | ¥ 26,848 |  | ¥ 26,848 |  | ¥ 22,874
Number of investment securities in an unrealized loss position | Investment | 1,273 |  | 1,273 |  | 1,208
Debt securities available-for-sale accrued interest, after allowance for credit loss | ¥ 12,918 |  | ¥ 12,918 |  | ¥ 10,781
Accrued Interest Receivables |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Allowance for credit loss of accrued interest | 0 |  | 0 |  | 0
Equity securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investment funds fair value | 19,401 |  | 19,401 |  | 16,032
Trading Debt Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Net unrealized holding gains (losses) on trading debt securities | (23) | 104 | (28) | 198 |
Available-for-sale securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-Sale, Purchased credit deterioration financial assets | 0 | ¥ 0 | 0 | ¥ 0 |
Available-for-sale securities | Foreign Government Bond Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investment funds fair value | 314 |  | 314 |  | 237
Available-for-sale securities | Foreign Corporate Debt Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investment funds fair value | ¥ 7,133 |  | ¥ 7,133 |  | ¥ 6,605

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