Notes - Segment Information, Etc.
| Concept | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                38,638,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,638,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,422,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,215,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,493,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,198,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,295,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,493,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                226,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -226,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                226,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -27,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                317,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                1,921,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,903,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,906,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,847,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,853,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,867,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                3,292,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -54,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,237,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,262,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,107,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,105,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,112,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |