Key Financial Data Of Reporting Company
| Concept | 2024-10-01 to 2025-03-31 | As at 2025-03-31 | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | 
                                                47,450,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                89,782,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,160,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                1,770,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,477,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,720,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                25,705,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,863,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                25,001,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                47,446,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,961,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                45,255,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                46.81
                                                
                                             | — | — | 
                                                54.86
                                                
                                             | 
                                                46.63
                                                
                                             | — | 
| Diluted earnings per share |  | — | — |  |  | — | 
| Equity-to-asset ratio | — | 
                                                0.542
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.553
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.552
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | 
                                                1,360,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,825,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -549,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -1,479,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -641,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -187,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                821,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -640,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                409,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                12,924,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,184,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,079,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |