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 | — | 
                                                54,508,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,824,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                51,860,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                4,322,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,412,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,384,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                2,884,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,784,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,931,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                2,206,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,005,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,251,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                86,193,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                84,284,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                82,639,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                99,414,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                102,701,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,616,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                84.01
                                                
                                             | 
                                                169.42
                                                
                                             | — | — | 
                                                85.86
                                                
                                             | 
| Diluted earnings per share | — | 
                                                83.08
                                                
                                             | 
                                                167.31
                                                
                                             | — | — | 
                                                84.82
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.847
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.801
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.795
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                3,995,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,377,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                199,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                1,094,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,309,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,562,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -6,994,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,726,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,478,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                52,181,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                54,187,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,975,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |