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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Non-Accrual of Financial Assets (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | ¥ 147,893 | ¥ 73,118
Ending balance | 150,395 | 147,893
Interest income recognized during the reporting period | 147 | 345
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 2,504 | 2,975
Consumer borrowers | Real estate loans | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,235 | 1,095
Ending balance | 1,288 | 1,235
Interest income recognized during the reporting period | 135 | 260
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 100 | 128
Consumer borrowers | Real estate loans | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 4,976 | 1,107
Ending balance | 5,579 | 4,976
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 99 | 0
Consumer borrowers | Card loans | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 0 | 0
Ending balance |  | 0
Interest income recognized during the reporting period |  | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income |  | 0
Consumer borrowers | Other | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 86 | 96
Ending balance | 0 | 86
Interest income recognized during the reporting period | 0 | 1
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Consumer borrowers | Other | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 2,373 | 2,574
Ending balance | 2,385 | 2,373
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 8 | 4
Corporate borrowers | Non-recourse Loans | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 3,831 |
Ending balance | 8,764 | 3,831
Interest income recognized during the reporting period | 0 |
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 |
Corporate borrowers | Non-recourse Loans | The Americas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 3,831 | 3,116
Ending balance |  | 3,831
Interest income recognized during the reporting period |  | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income |  | 603
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 29 | 115
Ending balance | 32 | 29
Interest income recognized during the reporting period | 10 | 30
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 52,272 | 16,093
Ending balance | 71,865 | 52,272
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 520 | 355
Ending balance | 551 | 520
Interest income recognized during the reporting period | 2 | 54
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 37
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 60,629 | 27,636
Ending balance | 40,263 | 60,629
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 2,297 | 2,203
Loans to Equity Method Investees |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,345 | 1,929
Ending balance | 1,344 | 1,345
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Net investment in leases |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 20,597 | 19,002
Ending balance | 18,324 | 20,597
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | ¥ 0 | ¥ 0

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