Semi-Annual Consolidated Statement Of Cash Flows
| Concept | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | — | 
                                                1,535,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,018,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | — | 
                                                210,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                189,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                93,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | — | 
                                                -401,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -247,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Foreign exchange losses (gains) | — | 
                                                -23,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in provision for bonuses | — | 
                                                13,791,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | — | 
                                                -365,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -250,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | — | 
                                                -1,616,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -225,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                36,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | — | 
                                                -858,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                511,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                401,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                247,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -1,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,598,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -209,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -302,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -667,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                454,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -1,002,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -571,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -203,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -13,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -884,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -774,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from short-term borrowings | — | 
                                                470,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                370,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of short-term borrowings | — | 
                                                -370,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -370,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -102,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -116,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of shares | — | 
                                                10,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                -394,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -620,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -616,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -964,327,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -675,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -2,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                15,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -2,500,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -980,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                2,192,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,692,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,673,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |