Notes - Segment Information
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|
| Notes - Segment information | ||||
| Segment information | ||||
| Revenue | ||||
| Revenue | — | 
                                                18,960,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,515,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Share of profit (loss) of investments accounted for using equity method | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) before tax | — | 
                                                101,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                179,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Assets | 
                                                13,671,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                13,230,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments accounted for using equity method | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Depreciation and amortization | — | 
                                                378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                292,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |