v3.26.1
Cash segregated as deposits (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Cash segregated as deposits [Abstract]    
Cash segregated as deposits ¥ 50,024 ¥ 51,655
Deposits received ¥ 49,814 ¥ 50,911