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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Past Due Modifications of Financing Receivable (Detail) - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 1,879 |  | ¥ 2,066
Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 208 |  | 395
Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | 3 |  | 7
Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified | ¥ 205 |  | ¥ 388
Current |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | ¥ 4,084 |
Current | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 3,471 |
Current | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 5 |
Current | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 823 |
Current | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 2,643 |
Current | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 613 |
Current | Corporate borrowers | Other than Non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 613 |
Current | Corporate borrowers | Real estate companies in Japan | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
Current | Corporate borrowers | Commercial, industrial and other companies in Japan | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 285 |
Current | Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 328 |
Current | Net investment in leases |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
Current | Net investment in leases | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 34 |
30-89 days past-due | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 34 |
30-89 days past-due | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 4 |
30-89 days past-due | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 30 |
30-89 days past-due | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due | Corporate borrowers | Other than Non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due | Corporate borrowers | Real estate companies in Japan | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due | Corporate borrowers | Commercial, industrial and other companies in Japan | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due | Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due | Net investment in leases |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
30-89 days past-due | Net investment in leases | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
90 days or more past-due |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 307 |
90 days or more past-due | Consumer borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
90 days or more past-due | Consumer borrowers | Real estate loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
90 days or more past-due | Consumer borrowers | Card loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
90 days or more past-due | Consumer borrowers | Other |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
90 days or more past-due | Corporate borrowers |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 307 |
90 days or more past-due | Corporate borrowers | Other than Non-recourse loans |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 307 |
90 days or more past-due | Corporate borrowers | Real estate companies in Japan | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 35 |
90 days or more past-due | Corporate borrowers | Commercial, industrial and other companies in Japan | Japan |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 257 |
90 days or more past-due | Corporate borrowers | Commercial, industrial and other companies in overseas | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 15 |
90 days or more past-due | Net investment in leases |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | 0 |
90 days or more past-due | Net investment in leases | Overseas |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |
Financing Receivable, Modified |  | ¥ 0 |

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