Semi-Annual 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 | 
|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | 
                                                672,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                788,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                70,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                74,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Impairment losses | 
                                                1,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Amortization of goodwill | 
                                                8,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                -1,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -60,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | 
                                                -2,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | 
                                                1,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in retirement benefit liability | 
                                                602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in provision for bonuses | 
                                                11,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                759,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                276,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | 
                                                -23,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                15,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                -274,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                45,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                1,604,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,167,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                2,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -1,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -174,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -351,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                1,506,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                894,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                -15,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -23,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -29,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -38,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Purchase of treasury shares | 
                                                -446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -232,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -204,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -662,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -204,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                3,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                817,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                657,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                4,579,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,762,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,760,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,103,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |