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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, 2025
Mar. 31, 2024
Mar. 31, 2023
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers ¥ 1,352,263 ¥ 1,299,965 ¥ 1,303,365
Other revenues [1] 40,175 38,959 19,355
Total sales of goods and real estate and services income 2,874,821 2,814,361 2,663,659
Sales of goods      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 269,050 266,390 299,901
Real estate sales      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 104,105 107,524 92,668
Asset management and servicing      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 275,929 244,508 239,232
Automobile related services      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 87,173 88,325 82,428
Facilities operation      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 83,559 76,087 56,231
Environment and energy services      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 175,651 158,075 209,649
Real estate management and brokerage      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 102,369 99,843 98,593
Real estate contract work      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 162,921 152,022 120,379
Other      
Revenue From Contract With Customers [Line Items]      
Total revenues from contracts with customers 91,506 107,191 104,284
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 ¥ 1,392,438 ¥ 1,338,924 ¥ 1,322,720
[1] Other revenues are not in the scope of revenue from contracts with customers.