Quarterly Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,264,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,001,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                2,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                25,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,538,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,047,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                144,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                131,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | 
                                                236,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Investments and other assets | 
                                                215,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                451,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                597,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                613,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                4,135,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,660,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                147,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                194,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                251,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                339,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                690,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                719,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Asset retirement obligations | 
                                                38,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                21,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                165,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                855,732,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                858,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                279,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                279,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                279,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                279,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                2,720,430,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,244,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,279,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,802,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,279,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,802,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                4,135,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,660,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |