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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Allowance for Credit Losses for Installment Loans (Detail) (Parenthetical) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Provision for Credit Losses | ¥ 5,604 | ¥ 1,426 | ¥ 8,524 | ¥ 1,674 |
Allowance for Credit Losses | 69,046 |  | 69,046 |  | ¥ 64,723
Total charge-offs | 11,225 | 4,014 | 14,706 | 11,840 |
Purchased loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total charge-offs | 7,288 | 2,261 | 7,612 | 2,309 |
Purchased loans | Financial asset acquired with credit deterioration |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total charge-offs | ¥ 7,261 | ¥ 2,067 | ¥ 7,580 | ¥ 2,095 |

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