Key Financial Data Of Group
| Concept | As at 2023-09-30 | 2023-07-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-09-30 | 2022-07-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | — | — | 
                                                108,726,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                211,285,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                102,562,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                7,235,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                17,328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                5,122,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,529,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,131,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | 
                                                5,414,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,558,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,061,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                143,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                140,171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                134,434,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | 
                                                300,027,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                298,623,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                300,807,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | — | 
                                                35.15
                                                
                                             | 
                                                62.58
                                                
                                             | — | 
                                                140.87
                                                
                                             | — | 
                                                26.67
                                                
                                             | 
                                                50.48
                                                
                                             | 
| Diluted earnings per share | — | — |  | — |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.476
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.467
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.445
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                14,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                20,071,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,785,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -6,912,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -34,306,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -19,615,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -7,162,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,745,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                22,468,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                22,202,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                22,255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                29,383,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |