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Investment in Securities (Summary of Roll-forwards of Allowance for Credit Losses) (Detail) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |  |
Beginning | ¥ 454 | ¥ 163 | ¥ 144 | ¥ 153
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded |  |  | 292 |
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net |  |  |  | (5)
Increase (Decrease) from the effects of changes in foreign exchange rates | 14 | 9 | 32 | 24
Ending | 468 | 172 | 468 | 172
Foreign municipal bond securities |  |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |  |
Beginning | 238 | 147 | 144 | 132
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded |  |  | 80 |
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 | 8 | 9 | 22 | 24
Ending | 246 | 156 | 246 | 156
Japanese other asset- backed securities and debt securities |  |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |  |
Beginning |  | 16 |  | 21
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net |  |  |  | (5)
Increase (Decrease) from the effects of changes in foreign exchange rates |  | 0 |  | 0
Ending |  | ¥ 16 |  | ¥ 16
Foreign other asset- backed securities and debt securities |  |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |  |
Beginning | 216 |  | 0 |
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded |  |  | 212 |
Increase (Decrease) from the effects of changes in foreign exchange rates | 6 |  | 10 |
Ending | ¥ 222 |  | ¥ 222 |

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- Definition Accounts and financing receivable allowance allowance for credit losses increase due to losses previously not recored. + 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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