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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, 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