Quarterly Consolidated 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 | 
|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | 
                                                210,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                275,739,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                47,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                38,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Amortization of goodwill | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                65,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                -235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -48,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | 
                                                -891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | 
                                                95,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Foreign exchange losses (gains) | 
                                                -225,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -128,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Loss (gain) on sale of property, plant and equipment | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                266,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                421,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | 
                                                -91,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                193,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                82,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                15,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                7,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                144,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                760,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -95,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -33,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -73,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                111,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                687,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of investment securities | 
                                                -42,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -68,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Purchase of treasury shares | 
                                                -84,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -160,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -162,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid to non-controlling interests | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -161,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -160,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                197,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                129,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                78,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                657,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                7,456,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,377,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,960,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,302,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |