Notes - Segment Information, Etc.
| Concept | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                8,806,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,806,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,406,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                380,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                707,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,586,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,586,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,854,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                12,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -27,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                331,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                857,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                526,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |