Consolidated Statement Of Income
| Concept | 
                                    
                                        2023-04-01 to 2023-09-30  | 
                            
                        
|---|---|
| Consolidated statement of income | |
| Statement of income | |
| Net sales | 
                                        
                                             
                                                4,289,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Cost of sales | 
                                        
                                             
                                                2,193,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Operating expenses | |
| Selling, general and administrative expenses | 
                                        
                                             
                                                1,076,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Provision of allowance for doubtful accounts | 
                                        
                                             
                                                377,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Operating expenses | |
| Other operating expenses | |
| Operating expenses | |
| Operating expenses | |
| Gross profit (loss) | 
                                        
                                             
                                                2,095,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Net sales | |
| Operating profit (loss) | 
                                        
                                             
                                                1,018,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| General and administrative expenses | |
| Ordinary profit (loss) | 
                                        
                                             
                                                1,012,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Cost of sales | |
| Selling, general and administrative expenses | |
| Non-operating income | |
| Interest income | 
                                        
                                             
                                                28,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Dividend income | 
                                        
                                             
                                                602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Interest on securities | 
                                        
                                             
                                                1,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Non-operating income | 
                                        
                                             
                                                2,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Miscellaneous income | 
                                        
                                             
                                                408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Extraordinary income | 
                                        
                                             
                                                131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Non-operating expenses | 
                                        
                                             
                                                8,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Non-operating expenses | |
| Profit (loss) before income taxes | 
                                        
                                             
                                                1,012,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Gross profit | |
| Extraordinary income | |
| Gain on sale of non-current assets | 
                                        
                                             
                                                131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Income taxes - current | 
                                        
                                             
                                                424,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Income taxes - deferred | 
                                        
                                             
                                                -3,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Income taxes | 
                                        
                                             
                                                420,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Profit (loss) | 
                                        
                                             
                                                592,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Profit (loss) attributable to non-controlling interests | 
                                        
                                             
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Profit (loss) attributable to owners of parent | 
                                        
                                             
                                                592,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Profit attributable to | |
| Other comprehensive income | |
| Valuation difference on available-for-sale securities | 
                                        
                                             
                                                922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Other comprehensive income | 
                                        
                                             
                                                922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Comprehensive income | 
                                        
                                             
                                                593,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Comprehensive income attributable to | |
| Comprehensive income attributable to owners of parent | 
                                        
                                             
                                                593,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Comprehensive income attributable to non-controlling interests | 
                                        
                                             
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     |