Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                11,165,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,474,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                146,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -60,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -58,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                18,890,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,913,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,298,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,350,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                123,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                13,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                196,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                208,718,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                3,240,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,140,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                2,479,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,378,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                230,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                49,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                4,736,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,698,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                23,626,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,612,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                3,123,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,143,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                1,039,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,080,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                4,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                6,570,799,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,810,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                2,109,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,472,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                78,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                264,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                258,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                2,452,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,810,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                9,023,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,620,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                166,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                708,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                708,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                446,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                446,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                13,841,732,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,246,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -482,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -482,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                14,514,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,919,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                -14,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                9,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                -5,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                93,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                14,603,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,991,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                23,626,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,612,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |