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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers ¥ 1,299,965 ¥ 1,303,365 ¥ 1,246,098
Other revenues [1] 38,959 19,355 5,904
Total sales of goods and real estate and services income 2,814,361 2,663,659 2,508,043
Sales of goods      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 266,390 299,901 340,697
Real estate sales      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 107,524 92,668 94,700
Asset management and servicing      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 244,508 239,232 244,887
Automobile related services      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 88,325 82,428 76,772
Facilities operation      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 76,087 56,231 32,163
Environment and energy services      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 158,075 209,649 156,327
Real estate management and brokerage      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 99,843 98,593 100,304
Real estate contract work      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 152,022 120,379 92,999
Other      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 107,191 104,284 107,249
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 ¥ 1,338,924 ¥ 1,322,720 ¥ 1,252,002
[1] Other revenues are not in the scope of revenue from contracts with customers.