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Leases - Lessor: Lease Income (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Lease income—net investment in leases |  |  |
Interest income |  | ¥ 47,828 | ¥ 45,715
Other |  | 1,926 | 2,044
Lease income – operating leases | [1] | 309,624 | 310,848
Total lease income |  | ¥ 359,378 | ¥ 358,607
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues | Revenues
[1] | Gains from the disposition of real estate under operating leases included in operating lease revenues were ¥23,587 million and ¥0 million, and gains from the disposition of operating lease assets other than real estate included in operating lease revenues were ¥21,059 million and ¥0 million, for the six months ended September 30, 2024 and 2025, respectively.

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- Definition Capital Leases Direct Financing And Sales Type Lease Other Income + References No definition available. + Details
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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 + Details
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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 + Details
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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 + Details
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- Definition 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 + Details
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