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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, 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