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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
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