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 | 
                                                2,522,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,977,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                364,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                330,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Amortization of goodwill | 
                                                11,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | 
                                                -34,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -22,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | 
                                                5,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in retirement benefit liability | 
                                                -7,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in provision for bonuses | 
                                                29,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                33,798,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Share of loss (profit) of entities accounted for using equity method | 
                                                52,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | 
                                                27,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -82,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                -818,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -720,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                405,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -396,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                9,171,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,416,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                34,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -5,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -28,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,741,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                9,379,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,695,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                -542,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -622,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                6,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -18,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of investment securities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Loan advances | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | 
                                                685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                66,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                39,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -476,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -595,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Repayments of long-term borrowings | 
                                                -100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | 
                                                -75,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -462,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -320,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -1,266,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -426,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                13,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                7,651,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,677,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                9,944,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,293,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,622,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,945,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |