Statement Of Cash Flows
| Concept | 2024-01-01 to 2024-06-30 | As at 2024-06-30 | As at 2023-12-31 | 2023-01-01 to 2023-06-30 | As at 2023-06-30 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|
| Statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | 
                                                494,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                287,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                521,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                489,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                1,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | 
                                                -14,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | 
                                                6,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Foreign exchange losses (gains) | 
                                                -6,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -54,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                -340,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                346,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | 
                                                -57,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                101,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                242,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -92,426,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                1,114,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,022,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                257,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -57,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -169,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -52,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                952,544,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                974,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                14,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -6,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -8,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | ||||||
| Cash flows from operating activities | ||||||
| Cash flows from facilities maintenance and investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                -434,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -828,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                4,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Net cash provided by (used in) investing activities | 
                                                -470,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -845,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Purchase of treasury shares | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -374,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -216,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -225,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | 
                                                -335,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -403,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -552,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,003,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                251,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                129,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                181,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -745,068,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                5,662,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,481,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,623,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,368,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |