Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-06-30 | As at 2023-12-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                9,615,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,849,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                150,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                610,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                535,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                35,292,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,822,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                14,225,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,129,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                4,092,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,075,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                3,190,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,105,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                5,732,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,671,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                683,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                756,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                526,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                520,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                361,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                392,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                30,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                940,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                999,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                4,244,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,391,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                1,094,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,161,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                567,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                663,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                614,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                599,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                19,409,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,521,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                54,702,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,344,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                1,968,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,968,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                4,359,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,333,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                1,530,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,574,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                531,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                558,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,843,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,565,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                13,082,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,901,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                311,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                358,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                1,769,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,869,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                836,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                974,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                3,749,157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,040,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                16,831,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,941,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                318,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                263,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                584,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                584,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                3,522,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,522,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                2,767,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,767,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                27,304,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,632,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,562,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,562,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                32,032,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,360,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                159,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                114,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                909,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                456,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                456,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                472,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,525,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,043,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                4,312,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,998,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                37,871,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,402,799,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                54,702,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,344,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |