v3.26.1
Impairment of Goodwill - Additional Information (Details) - JPY (¥)
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of information for cash-generating units [line items]    
Period over which management has projected cash flow and dividend projections 5 years  
Impairment losses were recognized for goodwill ¥ 0 ¥ 0