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 | 
                                                315,942,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                353,038,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                353,038,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,096,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                371,639,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,910,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                371,639,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                334,729,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                11,068,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,940,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,007,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,872,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,142,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                113,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,877,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,256,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,264,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                18,811,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,517,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,734,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                706,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                216,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,957,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                251,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,018,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,706,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |