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Lease Income (Operating Lease) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lessor, Lease, Description [Line Items]
Gains on sales of operating lease assets			¥ 27,792	¥ 31,577
Real Estate Asset
Lessor, Lease, Description [Line Items]
Gains on sales of operating lease assets	¥ 8,837	¥ 2,766	10,066	12,487
Operating Lease Assets Other than Real Estate
Lessor, Lease, Description [Line Items]
Gains on sales of operating lease assets	¥ 10,165	¥ 9,320	¥ 17,726	¥ 19,090

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

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