v3.26.1
Financial risk management - Changes in allowance for doubtful receivables (Details) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Balance at beginning of period ¥ 62,190  
Balance at end of period 61,931 ¥ 62,190
Impairment loss allowance    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Balance at beginning of period 0 0
Increase 0 0
Balance at end of period ¥ 0 ¥ 0