Key Financial Data Of Reporting Company
| 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 reporting company | ||||||||
| Business results of reporting company | ||||||||
| Net sales | — | — | 
                                                23,286,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                43,765,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                19,017,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                680,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -405,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -304,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                9,254,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,711,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,824,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | 
                                                36,732,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                36,903,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                34,349,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | — | 
                                                36.87
                                                
                                             | 
                                                21.81
                                                
                                             | — | 
                                                -115.26
                                                
                                             | — | 
                                                -3.06
                                                
                                             | 
                                                -33.69
                                                
                                             | 
| Diluted earnings per share | — | — |  | — |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.250
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.236
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.286
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                -34,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,271,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -66,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -368,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -864,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -493,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -570,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,524,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                710,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                3,201,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,683,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,441,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |