v3.25.2
Financial risk management - Changes in allowance for doubtful receivables (Details) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Balance, beginning of period ¥ 72,280  
Balance, end of period 62,190 ¥ 72,280
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, beginning of period 0 0
Increase (decrease) in financial assets 0 0
Balance, end of period ¥ 0 ¥ 0