Key Financial Data Of Group
| Concept | As at 2023-09-30 | 2023-07-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-09-30 | 2022-07-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | — | — | 
                                                152,906,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                329,389,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                168,472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                7,625,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                12,437,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,383,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                5,020,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,124,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,789,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | 
                                                7,636,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,397,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,329,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                78,399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                72,158,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                71,334,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | 
                                                147,179,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                143,200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                150,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | — | 
                                                113.99
                                                
                                             | 
                                                204.04
                                                
                                             | — | 
                                                330.16
                                                
                                             | — | 
                                                101.24
                                                
                                             | 
                                                194.65
                                                
                                             | 
| Diluted earnings per share | — | — |  | — |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.504
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.475
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                1,533,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,596,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,716,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -1,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -261,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                162,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -2,783,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,099,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                347,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                16,959,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                18,860,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,267,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |