Notes - Statement Of Income
| Concept | 
                                    
                                        2024-04-01 to 2025-03-31  | 
                            
                                
                                    
                                        2023-04-01 to 2024-03-31  | 
                            
                        
|---|---|---|
| Notes - Statement of income | ||
| Notes - Statement of income | ||
| Notes regarding amount of revenue from contracts with customers | 
                                        
                                             ※1 顧客との契約から生じる収益 顧客との契約から生じる収益の金額は、財務諸表「注記事項(収益認識関係)1 顧客との契約から生じる収益を分解した情報」に記載しております。 
  | 
                                
                                    — | 
| Notes regarding write-downs of inventories | — | |
| Write-downs of inventories | 
                                        
                                             
                                                20,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                19,597,000
                                                
                                                    
                                                        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 | 
                                        
                                             
                                                105,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                132,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Notes regarding loss on disposal of property, plant and equipment | — |