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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Purchased Loans (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Credit Loss [Abstract] |  |  |
Purchase price | ¥ 2,444 | ¥ 4,926 | ¥ 2,705
Allowance for credit losses at acquisition date | 6,901 | 2,210 | 3,899
Discount or premium attributable to other factors | 261 | 220 | 254
Par value | ¥ 9,606 | ¥ 7,356 | ¥ 6,858

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- Definition Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
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- Definition Amount at par value of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
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