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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
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Credit Loss [Abstract] |  |  |
Purchase price | ¥ 5,264 | ¥ 12,271 | ¥ 2,444
Allowance for credit losses at acquisition date | 7,507 | 47,676 | 6,901
Discount or premium attributable to other factors | 1,332 | 1,188 | 261
Par value | ¥ 14,103 | ¥ 61,135 | ¥ 9,606

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-19 + Details
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