Semi-Annual Consolidated Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                9,175,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,224,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                167,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                201,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -44,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -44,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                15,511,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,168,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,308,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,345,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                123,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                10,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                228,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                250,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                2,723,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,453,632,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                1,974,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                778,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                220,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                246,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                47,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                4,261,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,049,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                19,772,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,217,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                2,843,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,063,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                1,083,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                667,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,672,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,663,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,818,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,248,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                78,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                255,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                218,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                2,152,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,545,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                7,825,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,209,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                121,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                708,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                670,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                446,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                408,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                11,230,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,442,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -482,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -482,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                11,902,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,038,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                -18,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -66,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                -18,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -83,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                63,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                11,947,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,008,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                19,772,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,217,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |