v3.26.3
Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Purchased Loans (Detail) - JPY (¥)
¥ in Millions
6 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Credit Loss [Abstract]    
Purchase price ¥ 0 ¥ 3,862
Allowance for credit losses at acquisition date 0 3,633
Discount or premium attributable to other factors 0 876
Par value ¥ 0 ¥ 8,371