Key Financial Data Of Group
| Concept | As at 2025-02-28 | 2024-09-01 to 2025-02-28 | As at 2024-08-31 | 2023-09-01 to 2024-08-31 | As at 2024-02-29 | 2023-09-01 to 2024-02-29 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                12,189,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                17,694,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,418,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                880,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,362,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                848,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                766,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,094,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                602,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                768,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,091,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                601,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                12,484,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                12,058,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,568,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                25,614,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                22,405,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,694,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                117.72
                                                
                                             | — | 
                                                167.33
                                                
                                             | — | 
                                                92.10
                                                
                                             | 
| Diluted earnings per share | — |  | — | 
                                                167.25
                                                
                                             | — | 
                                                92.04
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.487
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.538
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.533
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                528,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -497,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -1,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -455,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -82,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                1,632,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -202,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -483,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                6,275,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,524,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,305,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |