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 | 
                                                50,624,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,828,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,624,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,796,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,623,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,623,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,927,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,696,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                685,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                677,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -685,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                792,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -792,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                792,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                988,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                493,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                986,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                494,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                921,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,426,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                916,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                444,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                476,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                1,176,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                823,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,176,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                352,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,157,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,157,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                634,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                523,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |