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 | — | 
                                                114,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                222,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                108,726,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                6,520,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,780,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,235,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                147,666,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                145,844,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                143,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                290,686,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                298,580,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,173,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                53.66
                                                
                                             | 
                                                143.50
                                                
                                             | — | — | 
                                                62.58
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.506
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.486
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.476
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                11,637,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,176,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -8,205,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -6,912,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -9,262,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,013,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,162,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                18,269,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,707,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,202,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |