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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 | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule Of Gain Loss On Investments Held At Cost Balance Sheet and Income Statement Reported Amounts Summary [Line Items] |  |
Carrying value | ¥ 96,714 | ¥ 67,820
Accumulated impairments and downward adjustments | (16,171) | (14,062)
Accumulated upward adjustments | 2,201 | 1,742
Impairments and downward adjustments | (774) | (787)
Upward adjustments | ¥ 1,185 | ¥ 1,360

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