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 | 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 | 
                                                138,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,605,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,605,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,466,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                794,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,417,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,212,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,212,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                1,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -23,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                492,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                7,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |