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Investment in Securities (Summary of Roll-forwards of Allowance for Credit Losses) (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Accounts And Financing Receivable For Credit Losses [Line Items] |  |
Beginning | ¥ 670 | ¥ 634
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 128 | 35
Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period |  | 31
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net | (26) |
Increase (Decrease) from the effects of changes in foreign exchange rates | (1) | (160)
Ending | 771 | 540
Foreign municipal bond securities |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |
Beginning | 245 | 248
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 0 | 0
Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period |  | 0
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net | 0 |
Increase (Decrease) from the effects of changes in foreign exchange rates | (1) | (14)
Ending | 244 | 234
Foreign corporate debt securities |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |
Beginning | 34 |
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 0 |
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net | (26) |
Increase (Decrease) from the effects of changes in foreign exchange rates | 0 |
Ending | 8 |
Foreign other asset- backed securities and debt securities |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |
Beginning | 391 | 386
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 128 | 35
Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period |  | 31
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net | 0 |
Increase (Decrease) from the effects of changes in foreign exchange rates | 0 | (146)
Ending | ¥ 519 | ¥ 306

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- Definition Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period. + References No definition available. + Details
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- Definition Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-4 + Details
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