Notes - Balance Sheet
| Concept | 
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2024-03-31  | 
                            
                        
|---|---|---|---|
| Notes - Balance sheet | |||
| Notes - Balance sheet | |||
| Notes regarding amounts of notes and accounts receivable - trade and contract assets | — | — | |
| Notes regarding assets and liabilities incurred from transactions with affiliated entities | — | — | |
| Notes regarding revaluation of land for business | — | — | |
| Notes regarding pledged assets | — | ||
| Notes regarding amount of contract liabilities | — | — | |
| Notes regarding guarantee obligations | — | ||
| Notes regarding trade notes receivable discounted or transferred by endorsement | — | — | |
| Discounted trade notes receivable | 
                                        
                                             
                                                703,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                716,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     |