Key Financial Data Of Group
| Concept | 2024-01-01 to 2024-03-31 | As at 2024-03-31 | 2023-10-01 to 2024-03-31 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2023-01-01 to 2023-03-31 | As at 2023-03-31 | 2022-10-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | — | — | 
                                                2,209,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,516,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,378,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                118,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                298,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                234,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                113,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                156,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                177,718,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | 
                                                121,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                186,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                133,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                4,233,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,158,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,105,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                5,881,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,762,579,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,957,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                64.87
                                                
                                             | — | 
                                                48.99
                                                
                                             | — | 
                                                67.51
                                                
                                             | 
                                                40.52
                                                
                                             | — | 
                                                76.51
                                                
                                             | 
| Diluted earnings per share | — | — |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.720
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.722
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.689
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                50,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                348,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                371,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -28,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -103,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -39,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | 
                                                63,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -286,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -185,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                1,913,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,820,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,968,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |