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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, 2023 | Mar. 31, 2022 | Mar. 31, 2021
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 | ¥ 2,352,385 | ¥ 2,218,282 | ¥ 2,033,894
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 | 254,407 | 302,948 | 272,657
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 | 78,602 | 78,171 | 75,064
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 | 52,918 | 56,810 | 42,145
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 | 52,260 | 47,952 | 45,734
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 | 57,143 | 46,515 | 41,461
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 | 166,821 | 122,426 | 105,246
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 | 87,459 | 89,457 | 89,685
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 | 105,492 | 81,704 | 69,815
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 | 49,034 | 50,246 | 45,147
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 | ¥ 904,136 | ¥ 876,229 | ¥ 786,954

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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