Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-12-31 | As at 2024-06-30 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                12,525,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,954,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                179,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                149,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                25,081,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,775,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                8,147,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,835,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                5,648,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,655,516,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -2,648,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,548,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                3,000,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,106,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                3,850,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,844,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -2,829,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,662,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                1,020,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,181,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,821,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,761,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                2,002,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                477,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                7,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                7,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                338,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                381,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                102,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                208,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                244,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                11,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                8,494,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,228,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                33,575,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,004,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                15,193,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,168,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                1,630,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,486,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                860,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                860,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                1,001,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                731,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                679,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                759,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,235,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,976,949,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,416,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,591,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                133,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                69,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,782,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,975,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                7,017,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,952,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                33,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                5,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,338,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,338,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,022,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,022,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                24,144,790,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,643,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                26,505,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,003,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                40,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                11,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                52,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                26,558,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,051,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                33,575,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,004,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |