Semi-Annual Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                16,296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,138,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,835,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,402,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -13,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -13,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                32,581,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                20,533,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,263,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                5,626,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,626,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                445,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                414,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                9,546,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,275,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -7,151,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,334,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                2,394,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,940,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                4,469,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Goodwill | 
                                                4,127,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                62,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                342,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                113,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                9,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,857,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                3,006,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,875,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                219,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                231,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -69,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -184,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                34,379,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,511,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                66,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,872,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                8,753,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,954,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                9,360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,260,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                1,234,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,568,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                5,268,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,425,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                25,430,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                10,885,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,602,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                4,780,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,910,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                4,281,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,895,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                832,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                869,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                36,315,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,898,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for retirement benefits for directors (and other officers) | 
                                                78,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                812,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,087,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities for land revaluation | 
                                                42,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,791,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,785,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                2,789,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,783,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                27,166,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,006,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -643,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                31,104,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,576,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                33,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revaluation reserve for land | 
                                                -514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                -459,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -602,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                30,645,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,973,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                66,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,872,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |