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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers, and Other Sources of Revenue (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | ¥ 1,299,965 | ¥ 1,303,365 | ¥ 1,246,098
Other revenues | [1] | 38,959 | 19,355 | 5,904
Total sales of goods and real estate and services income |  | 2,814,361 | 2,663,659 | 2,508,043
Sales of goods |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 266,390 | 299,901 | 340,697
Real estate sales |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 107,524 | 92,668 | 94,700
Asset management and servicing |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 244,508 | 239,232 | 244,887
Automobile related services |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 88,325 | 82,428 | 76,772
Facilities operation |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 76,087 | 56,231 | 32,163
Environment and energy services |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 158,075 | 209,649 | 156,327
Real estate management and brokerage |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 99,843 | 98,593 | 100,304
Real estate contract work |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 152,022 | 120,379 | 92,999
Other |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 107,191 | 104,284 | 107,249
Sales of goods, Real estate and Services [Member] |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total sales of goods and real estate and services income |  | ¥ 1,338,924 | ¥ 1,322,720 | ¥ 1,252,002
[1] | Other revenues are not in the scope of revenue from contracts with customers.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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