v3.25.2
Basis of preparation of consolidated financial statements (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Apr. 01, 2023
[1]
Crypto Assets, Activity [Line Items]      
Deferred tax assets ¥ 386 ¥ 353 [1] ¥ 739
Cryptocurrency      
Crypto Assets, Activity [Line Items]      
Safeguard liabilities   649,211  
Safeguard assets   649,211  
Deferred tax assets 88,381 ¥ 198,788  
Cryptocurrency | Crypto Asset, Other      
Crypto Assets, Activity [Line Items]      
Safeguard liabilities 288,639    
Safeguard assets ¥ 288,639    
[1] The comparative information is restated due to change in accounting policy. See Note 2 (5) “Changes in