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Earnings per share (Tables)
6 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Summary of amounts and numbers used in calculation of net income attributable to NHI shareholders per share (basic and diluted)
A reconciliation of the amounts and the numbers used in the calculation of net income attributable to NHI shareholders per share (basic and diluted) is as follows:
 
    
Millions of yen

except per share data

presented in yen
 
    
Six months ended September 30
 
    
2024
   
2025
 
Basic—
    
Net income attributable to NHI shareholders
   ¥ 167,325     ¥ 196,643  
Weighted average number of shares outstanding
     2,954,723,390       2,955,292,000  
Net income attributable to NHI shareholders per share
   ¥ 56.63     ¥ 66.54  
  
 
 
   
 
 
 
Diluted—
    
Net income attributable to NHI shareholders
   ¥ 167,209     ¥ 196,543  
Weighted average number of shares outstanding
     3,063,523,353       3,045,701,918  
Net income attributable to NHI shareholders per share
   ¥ 54.58     ¥ 64.53