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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 | 6 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Schedule Of Gain Loss On Investments Held At Cost Balance Sheet and Income Statement Reported Amounts Summary [Line Items] |  |  |
Carrying value | ¥ 101,878 |  | ¥ 89,554
Accumulated impairments and downward adjustments | (17,611) |  | (16,955)
Accumulated upward adjustments | 15,095 |  | ¥ 3,643
Impairments and downward adjustments | (858) | ¥ (780) |
Upward adjustments | ¥ 12,363 | ¥ 634 |

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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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