Notes - Segment Information, Etc.
| Concept | 2020-10-01 to 2021-06-30 | 2020-10-01 to 2021-06-30 | 2020-10-01 to 2021-06-30 | 2020-10-01 to 2021-06-30 | 2020-10-01 to 2021-06-30 | 2019-10-01 to 2020-06-30 | 2019-10-01 to 2020-06-30 | 2019-10-01 to 2020-06-30 | 2019-10-01 to 2020-06-30 | 2019-10-01 to 2020-06-30 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information, etc. | ||||||||||
| Segment information | ||||||||||
| Disclosure of sales, profit (loss), asset, liability, and other items for each reportable segment | ||||||||||
| Sales | ||||||||||
| Revenues from external customers | 
                                                1,712,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                789,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,712,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                923,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                380,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                728,327,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,108,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,108,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |