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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Past Due Financial Assets Modified to Debtors (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | ¥ 16,495 | ¥ 24,963
30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 2,142
90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 46 | 62
Consumer borrowers | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 45 | 173
Consumer borrowers | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 1
Consumer borrowers | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 6 | 17
Consumer borrowers | Real estate loans | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 |
Consumer borrowers | Real estate loans | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 |
Consumer borrowers | Real estate loans | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 6 |
Consumer borrowers | Other | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 45 | 173
Consumer borrowers | Other | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 1
Consumer borrowers | Other | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 17
Corporate borrowers | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 16,348 | 23,857
Corporate borrowers | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 2,141
Corporate borrowers | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 40 | 45
Corporate borrowers | Non-recourse Loans | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 0
Corporate borrowers | Non-recourse Loans | Current | The Americas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 0
Corporate borrowers | Non-recourse Loans | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 2,141
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | The Americas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 2,141
Corporate borrowers | Non-recourse Loans | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 0
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | The Americas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 0
Corporate borrowers | Other than non-recourse loans | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 16,348 | 23,857
Corporate borrowers | Other than non-recourse loans | Current | Real estate companies | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 262 | 1,243
Corporate borrowers | Other than non-recourse loans | Current | Real estate companies | Overseas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 1,701
Corporate borrowers | Other than non-recourse loans | Current | Commercial, industrial and other companies | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 540 | 623
Corporate borrowers | Other than non-recourse loans | Current | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 15,546 | 20,290
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Real estate companies | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Real estate companies | Overseas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Commercial, industrial and other companies | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 0
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 40 | 45
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Real estate companies | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 27 | 29
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Real estate companies | Overseas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 0
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Commercial, industrial and other companies | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 | 0
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Commercial, industrial and other companies | Overseas |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 13 | 16
Loans to Equity Method Investees | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 933
Loans to Equity Method Investees | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | 0
Loans to Equity Method Investees | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified |  | ¥ 0
Net investment in leases | Current |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 102 |
Net investment in leases | Current | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 102 |
Net investment in leases | 30-89 days past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 |
Net investment in leases | 30-89 days past-due | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 |
Net investment in leases | 90 days or more past-due |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | 0 |
Net investment in leases | 90 days or more past-due | Japan |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Financing Receivable, Modified | ¥ 0 |

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