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 | — | — | 
                                                10,235,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                19,723,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,867,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                339,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                386,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                195,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,401,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,315,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,225,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | 
                                                9,544,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,903,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,930,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | — | 
                                                6.58
                                                
                                             | 
                                                14.81
                                                
                                             | — | 
                                                15.18
                                                
                                             | — | 
                                                4.17
                                                
                                             | 
                                                6.62
                                                
                                             | 
| Diluted earnings per share | — | — |  | — |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.666
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.705
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.691
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                495,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                662,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                497,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -29,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -21,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                30,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -76,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -184,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -34,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                5,426,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,018,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,075,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |