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 | 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 | 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 | 
                                                1,572,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,954,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,500,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,454,654,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,026,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,026,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,771,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,908,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,679,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,867,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,188,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,867,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||||
| Depreciation | 
                                                6,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                384,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                172,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                557,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                563,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                576,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                167,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                356,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                524,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                544,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                528,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                1,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                173,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                227,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                401,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,811,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,410,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                84,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                170,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                254,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                217,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                472,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                254,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |