Notes - Statement Of Income
| Concept | 
                                    
                                        2024-04-01 to 2025-03-31  | 
                            
                                
                                    
                                        2024-04-01 to 2025-03-31  | 
                            
                                
                                    
                                        2023-04-01 to 2024-03-31  | 
                            
                        
|---|---|---|---|
| Notes - Statement of income | |||
| Notes - Statement of income | |||
| Notes regarding write-downs of inventories | — | — | |
| Write-downs of inventories | 
                                        
                                             
                                                75,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                46,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Major components of selling, general and administrative expenses | — | — | |
| Research and development expenses included in general and administrative expenses and manufacturing costs for period | — | — | |
| Research and development expenses included in general and administrative expenses and manufacturing costs for period | 
                                        
                                             
                                                707,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                793,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Notes regarding total amount of operating transactions from or to affiliated entities and total amount of non-operating transactions from or to affiliated entities | — | — | |
| Notes regarding impairment losses | — | — |