v3.26.1
Equity - Narrative (Details) - JPY (¥)
12 Months Ended
Mar. 10, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 10, 2024
Mar. 31, 2024
Disclosure of classes of share capital [line items]          
Authorised share capital   ¥ 4,000,000      
Authorised share capital (in shares)   400,000,000      
Nominal value   ¥ 0.01      
Shares outstanding (in shares)   163,077,538 130,814,526 129,703,075 122,587,617
Non-redemption premium paid ¥ 1,593,000,000        
Equity distribution and subsequent cash receipts as equity contributions   ¥ 202,000,000      
Non-Redemption Shares          
Disclosure of classes of share capital [line items]          
Number of non-redemption shares (in shares) 973,000        
Shares outstanding (in shares)   854,242