Semi-Annual Statement Of Cash Flows
| Concept | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|
| Semi-annual statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                3,304,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,784,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                11,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -647,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -245,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                2,668,163,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,545,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -1,077,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,057,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                1,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | 
                                                -1,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,799,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -8,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -1,391,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,087,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Repayments of long-term borrowings | 
                                                -202,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -348,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | 
                                                -3,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -80,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -324,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -239,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -564,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -626,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -8,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                712,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                831,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                7,336,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,623,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,657,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |