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Leases - Lessor: Lease Income (Parenthetical) (Detail) - JPY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Lessor, Lease, Description [Line Items]
Gains on sales of operating lease assets	¥ 31,005	¥ 44,646
Real estate asset [member]
Lessor, Lease, Description [Line Items]
Gains on sales of operating lease assets	10,049	23,587
Operating lease assets other than real estate [member]
Lessor, Lease, Description [Line Items]
Gains on sales of operating lease assets	¥ 20,956	¥ 21,059

X

- Definition

The net gain (loss) arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 30
-Name Accounting Standards Codification
-Section 40
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481222/840-30-40-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 40
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482161/360-10-40-3A

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

+ Details

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X

- Details

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