Semi-Annual Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,550,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,453,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                545,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                508,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -14,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                16,933,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,546,317,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                8,352,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,076,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                2,491,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,328,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                1,457,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,475,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                3,854,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,854,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                253,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                192,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                295,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                225,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                310,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                360,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,808,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,285,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                891,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                263,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                939,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,043,805,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -22,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -22,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                10,472,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,721,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                27,405,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,268,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                2,652,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,740,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                1,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                40,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                433,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,243,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,257,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                6,634,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,590,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                2,312,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                622,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                1,948,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,945,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                17,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                269,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                238,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                4,574,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,844,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                11,208,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,434,692,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                156,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                309,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                2,185,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,185,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                744,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                744,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                14,845,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,558,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,881,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,881,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                15,892,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,605,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                8,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                237,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                199,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                -8,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -32,063,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                237,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                176,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                66,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                16,197,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,833,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                27,405,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,268,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |