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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 | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for credit losses | ¥ 18,723 | ¥ 20,968 | ¥ 8,117
Total charge-offs | 19,304 | 63,473 | 28,372
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total charge-offs | 7,547 | 47,722 | 7,142
Purchased loans | Financial asset acquired with credit deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total charge-offs | ¥ 7,507 | ¥ 47,676 | ¥ 6,901

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