Key Financial Data Of Reporting Company
| Concept | As at 2024-09-30 | 2024-04-01 to 2024-09-30 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | — | 
                                                105,591,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                197,431,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                91,306,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                6,999,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,918,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,595,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                97,063,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                93,987,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,082,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                180,950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                160,553,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                146,498,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                127.24
                                                
                                             | 
                                                212.10
                                                
                                             | — | — | 
                                                56.29
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.535
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.584
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.579
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -6,004,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                596,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,155,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                920,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,695,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                18,077,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,829,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,540,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                35,814,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                22,665,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,162,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |