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 | 
                                                3,849,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,817,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -75,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -82,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -792,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,863,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                3,077,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,024,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -1,190,598,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,792,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                9,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -920,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,554,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from long-term borrowings | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                750,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | 
                                                -431,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -615,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -1,108,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -589,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -2,298,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,230,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -88,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                264,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                193,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                123,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                433,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                7,730,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,606,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,173,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |