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Leases - Lessor: Lease Income (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Lease income—net investment in leases
Interest income		¥ 92,327	¥ 87,189	¥ 80,810
Other		3,849	2,500	2,568
Lease income – operating leases	[1]	624,444	535,490	499,541
Total lease income		¥ 720,620	¥ 625,179	¥ 582,919
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]		Revenues	Revenues	Revenues
[1] Gains from the disposition of real estate under operating leases included in operating lease revenues were ¥25,699 million, ¥20,960 million and ¥31,965 million, and gains from the disposition of operating lease assets other than real estate included in operating lease revenues were ¥31,233 million, ¥32,481 million and ¥44,668 million for fiscal 2023, 2024 and 2025, respectively.

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- Definition

Capital Leases Direct Financing And Sales Type Lease

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- Definition

Capital Leases Direct Financing And Sales Type Lease Other Income

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- Definition

Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-5

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- Definition

Indicates line item in statement of income or comprehensive income that includes operating lease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479016/842-30-45-3

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- Definition

Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-6A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479016/842-30-45-3

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Amount of interest income from net investment in sales-type and direct financing leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-5

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