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Revenues from Contracts with Customers - Summary of Costs of Goods and Real Estate Sold and Service Expense (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | ¥ 2,542,995 | ¥ 2,453,648 | ¥ 2,327,736
Costs of goods sold |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 184,674 | 179,799 | 254,407
Costs of real estate sold |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 87,159 | 88,828 | 78,602
Asset management and servicing |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 69,377 | 58,376 | 52,918
Automobile related services |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 56,832 | 56,880 | 52,260
Facilities operation |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 69,926 | 65,979 | 57,143
Environment and energy services |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 136,426 | 109,923 | 166,821
Real estate management and brokerage |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 93,296 | 88,973 | 87,459
Real estate contract work |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 139,430 | 132,656 | 105,492
Other |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | 38,858 | 47,314 | 49,034
Expenses of costs of goods and real estate sold and services expenses |  |  |
Sales And Costs Of Goods And Real Estate And Services Income And Expenses [Line Items] |  |  |
Total expenses of costs of goods and real estate sold and services expenses | ¥ 875,978 | ¥ 828,728 | ¥ 904,136

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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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