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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Financial Effect of Modifications of Financing Receivable (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Interest rate reduction | Consumer borrowers | Other | Maximum
Financing Receivable, Modifications [Line Items]
Interest rate reduction		16.80%
Interest rate reduction | Consumer borrowers | Other | Minimum
Financing Receivable, Modifications [Line Items]
Interest rate reduction		11.90%
Interest rate reduction | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas | Maximum
Financing Receivable, Modifications [Line Items]
Interest rate reduction	13.10%	14.30%
Interest rate reduction | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas | Minimum
Financing Receivable, Modifications [Line Items]
Interest rate reduction	3.30%	12.90%
Term extension | Consumer borrowers | Other
Financing Receivable, Modifications [Line Items]
Term extension	1 year	2 years 4 months 24 days
Term extension | Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan
Financing Receivable, Modifications [Line Items]
Term extension	6 months	2 years 7 months 6 days
Term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan
Financing Receivable, Modifications [Line Items]
Term extension	10 months 24 days	1 year
Term extension | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas
Financing Receivable, Modifications [Line Items]
Term extension	6 months	2 years 3 months 18 days
Term extension | Loans to Equity Method Investees
Financing Receivable, Modifications [Line Items]
Term extension		6 months
Term extension | Net investment in leases | Japan
Financing Receivable, Modifications [Line Items]
Term extension	2 months 12 days
Principal forgiveness | Consumer borrowers | Real estate loans
Financing Receivable, Modifications [Line Items]
Principal forgiveness	¥ 54
Principal forgiveness | Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas
Financing Receivable, Modifications [Line Items]
Principal forgiveness	¥ 1,099	¥ 7

X

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Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

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Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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