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 | 
                                                10,985,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,591,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                601,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                525,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                16,895,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,920,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                16,667,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,096,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                6,096,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,138,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                2,448,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,053,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                1,185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,257,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                1,969,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,004,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                783,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                747,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                7,289,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,953,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,866,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -30,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -30,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                25,926,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,054,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                42,821,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,974,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                1,261,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,491,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                7,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                239,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                760,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                14,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,598,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,704,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                13,197,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,954,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                3,181,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,362,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                332,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                478,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                1,329,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,315,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                510,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                565,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                16,378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses | 
                                                791,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                673,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                12,648,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,648,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                12,467,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,467,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                1,814,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,982,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -935,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -934,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                25,994,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                449,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                495,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                448,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                494,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                26,443,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,657,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                42,821,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,974,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |