Statement Of Changes In Equity
| Concept | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2023-09-30 | As at 2023-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2023-09-30 | 2021-10-01 to 2022-09-30 | 2021-10-01 to 2022-09-30 | As at 2022-09-30 | As at 2022-09-30 | As at 2022-09-30 | 2021-10-01 to 2022-09-30 | As at 2022-09-30 | As at 2022-09-30 | As at 2022-09-30 | 2021-10-01 to 2022-09-30 | 2021-10-01 to 2022-09-30 | As at 2022-09-30 | 2021-10-01 to 2022-09-30 | 2021-10-01 to 2022-09-30 | As at 2021-09-30 | As at 2021-09-30 | As at 2021-09-30 | As at 2021-09-30 | As at 2021-09-30 | As at 2021-09-30 | As at 2021-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity | |||||||||||||||||||||||||||||||||||
| Net assets | 
                                                9,532,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                319,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                9,532,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                164,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,339,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                710,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                164,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,826,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,826,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                319,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                710,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,633,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,698,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                319,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,698,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                710,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                164,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,504,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cumulative effects of changes in accounting policies | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                306,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                306,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                306,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Restated balance | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                164,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,826,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,826,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                319,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                710,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,633,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,004,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                319,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,004,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                710,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                164,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,811,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Changes during period | |||||||||||||||||||||||||||||||||||
| Dividends of surplus | — | 
                                                -205,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -205,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -205,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -205,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -205,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -205,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Profit (loss) | — | 
                                                911,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                911,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                911,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,027,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,027,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1,027,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Total changes during period | — | 
                                                705,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -58,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                705,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                705,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                822,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                822,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                822,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — |