v3.26.1
Revenue from services provided to customers - Schedule of disaggregation of investment banking revenue (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disaggregation Of Investment Banking Revenue [Abstract]      
Equity underwriting and distribution fees ¥ 40,997 ¥ 52,930 ¥ 45,478
Debt underwriting and distribution fees 47,014 48,383 27,456
Financial advisory fees 83,031 78,674 61,560
Other fees 29,506 32,247 38,771
Total ¥ 200,548 ¥ 212,234 ¥ 173,265