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Leases - Lessor: Lease Income (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended
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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

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- 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 + Details
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