v3.26.1
Crypto asset borrowings (Details) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Platform Operator, Crypto Asset [Abstract]      
Crypto asset borrowings fee ¥ 50 ¥ 51 ¥ 35