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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers, and Other Sources of Revenue (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers ¥ 1,303,365 ¥ 1,246,098 ¥ 1,087,555
Other revenues [1] 19,355 5,904 3,247
Total sales of goods and real estate and services income 2,666,373 2,520,365 2,292,708
Sales of goods      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 299,901 340,697 321,883
Real estate sales      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 92,668 94,700 89,070
Asset management and servicing      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 239,232 244,887 173,191
Automobile related services      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 82,428 76,772 72,000
Facilities operation      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 56,231 32,163 23,811
Environment and energy services      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 209,649 156,327 137,011
Real estate management and brokerage      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 98,593 100,304 101,942
Real estate contract work      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 120,379 92,999 80,179
Other      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 104,284 107,249 88,468
Sales of goods, Real estate and Services [Member]      
Revenue From Contract With Customers [Line Items]      
Total sales of goods and real estate and services income ¥ 1,322,720 ¥ 1,252,002 ¥ 1,090,802
[1] Other revenues are not in the scope of revenue from contracts with customers.