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Investment in Securities (Summary of Roll-forwards of Allowance for Credit Losses) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | ¥ 144 | ¥ 153 | ¥ 120
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 445 |  | 21
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net |  | (21) |
Increase (Decrease) from the effects of changes in foreign exchange rates | 45 | 12 | 12
Ending | 634 | 144 | 153
Foreign municipal bond securities |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | 144 | 132 | 120
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 80 |  | 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 | 24 | 12 | 12
Ending | 248 | 144 | 132
Japanese other asset- backed securities and debt securities |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | 0 | 21 | 0
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded |  |  | 21
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net |  | (21) |
Increase (Decrease) from the effects of changes in foreign exchange rates |  | 0 | 0
Ending |  | 0 | ¥ 21
Foreign other asset- backed securities and debt securities [Member] |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | 0 |  |
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 365 |  |
Increase (Decrease) from the effects of changes in foreign exchange rates | 21 |  |
Ending | ¥ 386 | ¥ 0 |

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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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