v3.25.2
Employee Benefits - Narrative (Details) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Employee Benefits [Abstract]      
Employee service period required for benefits 3 years    
Weighted average duration of defined benefit obligations 12 years 1 month 6 days 12 years 6 months  
Estimate of contributions expected to be paid to plan for next annual reporting period ¥ 10,168    
Defined contribution costs ¥ 52,692 ¥ 60,521 ¥ 46,446