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Cash Flow Information - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Schedule of Cash Flow, Supplemental [Line Items]
Real estate under operating leases transferred from installment loans as a result of real estate collateral acquired from non-recourse loans	¥ 12,494	¥ 9,442	¥ 750
Other assets transferred from installment loans as a result of real estate collateral acquired from non-recourse loans	2	29	12
Assets decreased due to deconsolidation of VIEs	3,201	1,777	7,752
Liabilities decreased due to deconsolidation of VIEs	1,051	0	¥ 3,916
Investment in securities transferred from installment loans as a result of restructuring	¥ 311	¥ 3,452

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Assets Decrease from Deconsolidation

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Investment in securities transferred from installment loans as a result of restructuring.

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Schedule of Cash Flow, Supplemental [Line Items]

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Value transferred out of other assets in noncash transactions.

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- Definition

Value transferred out of real estate owned (REO) in noncash transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-5

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