Notes - Segment Information, Etc.
| Concept | 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 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 2019-04-01 to 2020-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                5,399,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,955,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,876,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,358,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,589,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,870,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,070,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,698,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,430,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,671,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                919,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                492,692,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,539,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,964,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,778,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,483,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                518,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                765,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                395,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                404,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                545,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                891,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,236,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,144,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                776,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                652,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                366,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                348,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                252,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                361,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                958,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,175,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,748,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,733,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,358,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                463,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                447,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                464,327,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |