Key Financial Data Of Group
| 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 group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                5,787,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,153,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,056,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                185,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                398,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                249,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                90,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                245,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                107,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                157,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                385,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                203,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                12,099,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,088,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,955,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                17,804,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                18,097,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,774,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                0.68
                                                
                                             | 
                                                1.82
                                                
                                             | — | — | 
                                                0.80
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.646
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.636
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.640
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                599,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                956,971,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                494,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -366,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -592,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -516,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -35,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                417,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                3,134,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,911,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,125,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |