Notes - Segment Information, Etc.
| Concept | 2020-10-01 to 2021-03-31 | 2020-10-01 to 2021-03-31 | 2020-10-01 to 2021-03-31 | 2020-10-01 to 2021-03-31 | 2020-10-01 to 2021-03-31 | 2019-10-01 to 2020-03-31 | 2019-10-01 to 2020-03-31 | 2019-10-01 to 2020-03-31 | 2019-10-01 to 2020-03-31 | 2019-10-01 to 2020-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                634,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                718,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                718,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                686,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                294,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                980,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                980,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |