v3.25.2
Subsequent Events (Narrative) (Detail) - JPY (¥)
¥ / shares in Units, ¥ in Millions
12 Months Ended
Jun. 27, 2025
May 15, 2025
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Subsequent Event [Line Items]          
Cash dividend per common share (in YEN per share)     ¥ 45.50 ¥ 36.50 ¥ 30.50
Subsequent event          
Subsequent Event [Line Items]          
Cash dividend per common share (in YEN per share) ¥ 39.0        
Dividends, Common Stock ¥ 449,733        
Aggregated number of shares allowed for repurchase (in shares)   175,000,000      
Aggregate amount of shares allowed for repurchase   ¥ 250,000      
Subsequent event | Common stock          
Subsequent Event [Line Items]          
Shares authorized to be repurchased as % of total shares outstanding   1.50%