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 | 
                                                163,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,259,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,095,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,259,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                158,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,248,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,089,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,248,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                38,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                408,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                369,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                408,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                455,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                415,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                455,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                437,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                437,063,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                437,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                709,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                709,262,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                709,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |