Notes - Segment Information, Etc.
| Concept | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                85,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,425,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                280,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,791,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,791,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,442,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,438,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,442,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | |||||||||||
| Depreciation | 
                                                32,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                82,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                311,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                742,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                853,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                110,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                895,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |