v3.26.1
Leases - Additional information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Leases [Abstract]      
Lease income ¥ 1,698 ¥ 1,879 ¥ 2,794
Right-of-use asset for operating leases ¥ 138,708 ¥ 156,791