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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, 2024 | Mar. 31, 2023 | Mar. 31, 2022
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 | ¥ 2,453,648 | ¥ 2,327,736 | ¥ 2,215,160
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 | 179,799 | 254,407 | 302,948
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 | 88,828 | 78,602 | 78,171
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 | 58,376 | 52,918 | 56,810
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 | 56,880 | 52,260 | 47,952
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 | 65,979 | 57,143 | 46,515
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 | 109,923 | 166,821 | 122,426
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 | 88,973 | 87,459 | 89,457
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 | 132,656 | 105,492 | 81,704
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 | 47,314 | 49,034 | 50,246
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 | ¥ 828,728 | ¥ 904,136 | ¥ 876,229

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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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