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Employee benefit plans (Tables)
6 Months Ended
Sep. 30, 2025
Employee Benefit Plans [Abstract]  
Net periodic benefit cost for defined benefit plans
The net periodic benefit cost of the defined benefit plans of Japanese entities includes the following components.
 
    
Millions of yen
 
    
Six months ended September 30
 
    
2024
   
2025
 
Service cost
   ¥      2,884     ¥      2,702  
Interest cost
     2,020       2,528  
Expected return on plan assets
     (2,833     (2,684
Amortization of net actuarial losses
     922       368  
Amortization of prior service cost
     (230     (271
  
 
 
   
 
 
 
Net periodic benefit cost
   ¥ 2,763     ¥ 2,643