Notes - Segment Information, Etc.
| Concept | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 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 | 
                                                37,198,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,874,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,029,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,955,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,029,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,613,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,042,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,357,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,357,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,701,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,655,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                804,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,489,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                862,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,352,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,352,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                775,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,967,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                833,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||||
| Depreciation | 
                                                1,549,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,190,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,215,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                641,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,215,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                637,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,553,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,221,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,221,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,191,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income tax expense | 
                                                3,140,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,211,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,272,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,272,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,202,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,650,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,650,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                325,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                1,575,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                933,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,311,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                803,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,311,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                647,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,079,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,079,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,071,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |