Notes - Statement Of Income
| Concept | 
                                    
                                        2024-05-01 to 2025-04-30  | 
                            
                                
                                    
                                        2023-05-01 to 2024-04-30  | 
                            
                        
|---|---|---|
| Notes - Statement of income | ||
| Notes - Statement of income | ||
| Notes regarding write-downs of inventories | — | |
| Write-downs of inventories | 
                                        
                                             
                                                9,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                64,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| 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 | 
                                        
                                             
                                                992,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                914,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Notes regarding loss on disposal of property, plant and equipment | — |