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 | — | 
                                                154,455,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                307,699,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                152,906,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                8,560,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,476,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,625,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                88,844,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                82,097,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                144,433,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                143,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                147,179,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                285.61
                                                
                                             | 
                                                390.87
                                                
                                             | — | — | 
                                                204.04
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.615
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.572
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                2,057,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,693,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,533,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                187,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,706,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -2,149,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,381,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,783,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                22,041,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                21,088,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,959,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |