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 | — | 
                                                3,464,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,811,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,361,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                252,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                536,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                274,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                175,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                372,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                178,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                156,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                401,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                192,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,603,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,470,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,261,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                8,117,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,366,632,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,094,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                146.01
                                                
                                             | 
                                                309.54
                                                
                                             | — | — | 
                                                148.37
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.317
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.292
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.277
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                211,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -330,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                23,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -108,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -86,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -197,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                492,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                644,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                898,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                861,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                722,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |