Quarterly Balance Sheet
| Concept | As at 2024-06-30 | As at 2023-12-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,453,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,536,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                119,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                158,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                208,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                111,632,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -5,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                6,706,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,600,193,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                19,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | 
                                                347,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                345,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                50,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                296,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                287,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                274,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                63,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                92,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                53,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                234,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                234,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -77,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -76,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                641,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                681,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                7,347,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,281,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                450,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                63,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                226,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                304,156,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                4,065,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,982,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                210,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                335,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                35,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,949,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                45,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                415,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                531,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                4,481,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,514,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                573,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                572,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                571,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                570,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                1,752,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,653,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -88,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -88,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                2,809,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,708,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                10,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                10,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                45,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,866,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,767,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,347,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,281,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |