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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, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Provision for credit losses | ¥ 20,968 | ¥ 8,117 | ¥ 5,388
Total charge-offs | 63,473 | 28,372 | 24,897
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total charge-offs | 47,722 | 7,142 | 2,372
Purchased loans | Financial asset acquired with credit deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total charge-offs | ¥ 47,676 | ¥ 6,901 | ¥ 2,210

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