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 | 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 | 
                                                2,024,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,916,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,367,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                770,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,686,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                524,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,288,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,765,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,968,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                818,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,583,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                508,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                166,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                281,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                59,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                310,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                239,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                345,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                695,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                800,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,499,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                825,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                373,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                248,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                465,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |