Notes - Segment Information, Etc.
| Concept | 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 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                3,784,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,533,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,318,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,318,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,129,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,178,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,951,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,129,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                38,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -109,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                109,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -83,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                21,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,235,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,238,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -18,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,256,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,902,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -14,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,883,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,888,068,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                15,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,191,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,129,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -77,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,206,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,753,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,732,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,805,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |