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 | 
                                                3,747,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,581,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                814,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                569,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -14,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                18,186,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,844,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                8,875,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,399,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                3,854,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,854,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                693,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                320,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                294,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                294,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                302,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                992,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                900,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                2,010,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,913,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,040,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,035,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -22,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -22,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                11,180,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,615,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                29,367,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,460,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                112,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                94,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,760,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,590,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                6,770,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,385,981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                6,128,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,962,163,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                3,829,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,718,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                17,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                220,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                216,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                12,899,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,348,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for retirement benefits for directors (and other officers) | 
                                                6,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                324,215,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                342,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                2,185,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,185,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                744,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                744,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                15,036,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,760,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,874,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,881,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                16,090,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,807,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                11,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                294,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                237,981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                16,468,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,111,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                29,367,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,460,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |