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 | — | — | 
                                                4,236,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,577,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,655,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                373,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                685,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                474,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                206,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                874,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                624,501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | 
                                                215,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                914,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                649,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                5,107,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,538,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,337,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                9,463,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,373,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,544,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                52.63
                                                
                                             | — | 
                                                75.44
                                                
                                             | — | 
                                                324.40
                                                
                                             | 
                                                50.26
                                                
                                             | — | 
                                                231.68
                                                
                                             | 
| Diluted earnings per share | — | — | 
                                                73.95
                                                
                                             | — | 
                                                319.56
                                                
                                             | — | — | 
                                                228.30
                                                
                                             | 
| Equity-to-asset ratio | — | 
                                                0.533
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.500
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                160,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                766,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                221,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -416,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                418,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                560,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | 
                                                757,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -425,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                466,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                2,355,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,854,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,344,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |