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Investment in Securities (Information About Impairment and Upward or Downward Adjustments Resulting From Observable Price Changes) (Detail) - Equity security - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Schedule Of Gain Loss On Investments Held At Cost Balance Sheet and Income Statement Reported Amounts Summary [Line Items] |  |  |  |  |
Carrying value | ¥ 76,756 |  | ¥ 76,756 |  | ¥ 67,820
Accumulated impairments and downward adjustments | (14,126) |  | (14,126) |  | (14,062)
Accumulated upward adjustments | 1,947 |  | 1,947 |  | ¥ 1,742
Impairments and downward adjustments | (3) | ¥ (278) | (90) | ¥ (368) |
Upward adjustments | ¥ 832 | ¥ 27 | ¥ 956 | ¥ 896 |

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- Definition Equity Securities Accumulated Upward Adjustments. + References No definition available. + Details
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- Definition Schedule Of Gain Loss On Investments Held At Cost Balance Sheet and Income Statement Reported Amounts Summary. + References No definition available. + Details
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- Details
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