Key Financial Data Of Reporting Company
| Concept | As at 2024-12-31 | 2024-07-01 to 2024-12-31 | 2023-07-01 to 2024-06-30 | As at 2024-06-30 | As at 2023-12-31 | 2023-07-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | — | 
                                                17,442,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,131,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,428,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                936,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,988,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -543,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                13,530,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                13,486,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,018,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                28,688,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                24,045,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,094,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                75.04
                                                
                                             | 
                                                192.81
                                                
                                             | — | — | 
                                                -52.63
                                                
                                             | 
| Diluted earnings per share | — | 
                                                74.83
                                                
                                             | 
                                                192.19
                                                
                                             | — | — |  | 
| Equity-to-asset ratio | 
                                                0.471
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.560
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.438
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -5,366,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,916,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -8,632,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -127,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -102,949,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                5,513,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -111,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,010,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                2,264,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,116,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,542,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |