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Equity Method Investments
6 Months Ended
Sep. 30, 2025
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments
11.
Equity method investments
Equity method investments at March 31, 2025 and September 30, 2025 consists of the following:
 
    
Millions of yen
 
  
March 31, 2025
    
September 30, 2025
 
Investment in corporate entities
   ¥ 973,795      ¥ 825,879  
Investment in real estate joint ventures
     137,274        144,363  
Investment in partnerships and other investments
     208,946        270,437  
  
 
 
    
 
 
 
   ¥       1,320,015      ¥          1,240,679