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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Allowance for Credit Losses for Installment Loans (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Provision for credit losses | ¥ 9,989 | ¥ 7,319
Total charge-offs | 8,471 | 6,620
Purchased loans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total charge-offs | 3,659 | 608
Purchased loans | Financial asset acquired with credit deterioration |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total charge-offs | ¥ 3,633 | ¥ 597

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