Consolidated Statement Of Changes In Equity
| Concept | As at 2024-06-30 | 2024-01-01 to 2024-06-30 | As at 2024-06-30 | As at 2024-06-30 | As at 2024-06-30 | 2024-01-01 to 2024-06-30 | As at 2024-06-30 | 2024-01-01 to 2024-06-30 | 2024-01-01 to 2024-06-30 | 2024-01-01 to 2024-06-30 | 2024-01-01 to 2024-06-30 | 2024-01-01 to 2024-06-30 | As at 2024-06-30 | As at 2024-06-30 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-06-30 | 2023-01-01 to 2023-06-30 | As at 2023-06-30 | As at 2023-06-30 | As at 2023-06-30 | As at 2023-06-30 | 2023-01-01 to 2023-06-30 | 2023-01-01 to 2023-06-30 | 2023-01-01 to 2023-06-30 | 2023-01-01 to 2023-06-30 | As at 2023-06-30 | 2023-01-01 to 2023-06-30 | 2023-01-01 to 2023-06-30 | As at 2023-06-30 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of changes in equity | ||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity | ||||||||||||||||||||||||||||||||||||||||||
| Equity | 
                                                1,043,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,738,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,438,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,963,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,738,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                432,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,137,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                804,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,137,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,438,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,963,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,963,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                267,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                726,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,438,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,255,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                6,255,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,947,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,427,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,947,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,952,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                130,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                577,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | ||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | 
                                                218,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                218,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                218,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                148,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
| Other comprehensive income | — | 
                                                382,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                382,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                382,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                137,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                137,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                137,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
| Comprehensive income | — | 
                                                600,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                600,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                218,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                382,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                285,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                137,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                285,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
| Transactions with owners | ||||||||||||||||||||||||||||||||||||||||||
| Total transactions with owners | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                22,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — |