Key Financial Data Of Group
| 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 group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                3,989,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,526,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,756,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                426,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,135,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                228,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                286,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                670,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                185,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                264,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                761,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                196,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                7,652,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,529,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,956,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                11,222,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,284,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,990,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                44.43
                                                
                                             | 
                                                104.82
                                                
                                             | — | — | 
                                                29.18
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.682
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.811
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.633
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -1,912,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                717,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,911,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -161,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -64,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                1,707,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -661,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,803,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                1,357,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,723,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,457,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |