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 | 
                                                19,982,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,782,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,982,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,200,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,785,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,069,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,716,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,785,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -29,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -35,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                852,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                354,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                852,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                497,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                856,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                339,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                516,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                856,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                598,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                274,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                538,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                263,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                59,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                388,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                336,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |