Semi-Annual Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,101,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,411,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                583,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                499,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -14,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,974,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,260,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                6,801,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,835,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                3,701,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,701,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                325,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                368,168,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                277,283,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                460,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                397,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                580,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                120,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                2,987,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,842,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,290,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,053,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -428,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -424,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                10,185,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,257,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                16,160,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,518,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                852,083,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                831,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                97,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | 
                                                38,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                33,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,539,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,517,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                4,360,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,204,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                4,394,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,984,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                3,212,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,713,317,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                725,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                738,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                443,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                497,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                8,755,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,189,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                6,783,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,797,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                1,183,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,120,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -662,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -689,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                7,405,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,328,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                7,405,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,328,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                16,160,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,518,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |