Notes - Segment Information, Etc.
| Concept | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 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 | 2023-04-01 to 2024-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                10,088,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,946,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,089,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,138,646,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,232,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,596,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,232,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,636,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | |||||||||||
| Depreciation | 
                                                257,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                265,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                232,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                249,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,532,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                221,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                580,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                592,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                528,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                455,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                385,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                286,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |