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 | 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 | 
                                                2,442,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,438,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,442,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,087,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,087,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,087,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                46,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                853,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                742,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                110,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                895,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                840,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                464,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                375,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                906,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |