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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, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | ¥ 1,352,263 | ¥ 1,299,965 | ¥ 1,303,365
Other revenues | [1] | 40,175 | 38,959 | 19,355
Total sales of goods and real estate and services income |  | 2,874,821 | 2,814,361 | 2,663,659
Sales of goods |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 269,050 | 266,390 | 299,901
Real estate sales |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 104,105 | 107,524 | 92,668
Asset management and servicing |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 275,929 | 244,508 | 239,232
Automobile related services |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 87,173 | 88,325 | 82,428
Facilities operation |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 83,559 | 76,087 | 56,231
Environment and energy services |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 175,651 | 158,075 | 209,649
Real estate management and brokerage |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 102,369 | 99,843 | 98,593
Real estate contract work |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 162,921 | 152,022 | 120,379
Other |  |  |  |
Revenue From Contract With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 91,506 | 107,191 | 104,284
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 |  | ¥ 1,392,438 | ¥ 1,338,924 | ¥ 1,322,720
[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 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 13: 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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