Quarterly 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 | 
|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | — | 
                                                7,960,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,989,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | — | 
                                                904,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                692,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                -2,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | — | 
                                                -40,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -29,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Loss (gain) on sale of property, plant and equipment | — | 
                                                -2,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | — | 
                                                -1,512,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                496,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | — | 
                                                291,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,148,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | — | 
                                                -2,329,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -203,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                431,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                782,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | — | 
                                                5,317,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,641,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                35,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -1,904,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -246,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                3,448,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,891,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -2,339,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,167,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                146,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -47,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -35,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -2,449,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,217,156,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -1,479,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,475,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -1,479,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,475,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                18,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -480,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,198,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                59,386,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                59,866,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,667,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |