Notes - Segment Information, Etc.
| Concept | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                1,217,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,208,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,861,426,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                129,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,208,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,881,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,009,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,009,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                118,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,009,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                2,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                4,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                358,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                353,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                358,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                136,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,317,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                141,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |