Semi-Annual Statement Of Cash Flows
| Concept | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2022-01-01 to 2022-12-31 | As at 2022-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|
| Semi-annual statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | 
                                                5,292,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,070,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                195,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                186,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                -858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | 
                                                -41,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -9,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Foreign exchange losses (gains) | 
                                                -92,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                46,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in provision for retirement benefits | 
                                                13,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in provision for bonuses | 
                                                3,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                1,988,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,381,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | 
                                                -329,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                -236,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                219,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -7,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                6,674,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,366,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                30,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -2,718,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,200,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                3,991,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,172,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -262,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -178,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -270,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,553,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | 
                                                -177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -2,380,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,570,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -2,381,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,570,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                1,341,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,048,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                8,716,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,375,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,326,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |