v3.26.1
Leases - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2024
Schedule of Operating Leases [Line Items]    
Lease receivable of net investment expiration period 23 years  
Remaining expiration period 55 years  
Sale and leaseback transaction, gain (loss), net   ¥ 2,661