Consolidated Statement Of Changes In Equity
| Concept | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 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 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of changes in equity | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net assets | 
                                                -4,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                319,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,451,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,084,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,450,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -73,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,084,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,134,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -55,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,499,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -17,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                115,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                115,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,510,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -17,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                315,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,134,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,062,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,467,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                308,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,062,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,479,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Changes during period | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dividends of surplus | — | 
                                                -122,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -122,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -122,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -122,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -103,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -103,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -103,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -103,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Net changes in items other than shareholders' equity | — | — | — | — | — | — | — | 
                                                -861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                12,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -1,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                3,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Total changes during period | — | 
                                                -60,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -49,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -48,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                12,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -49,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -1,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -55,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |