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 | 
                                                13,388,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,659,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,329,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,851,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                68,973,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,780,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                34,443,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,742,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                33,137,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,010,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -22,505,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -21,998,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                10,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,012,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                22,529,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,035,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -20,299,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -19,850,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                2,230,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,184,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                20,490,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,490,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                308,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                1,941,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,971,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                1,941,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,971,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                4,022,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,828,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                1,672,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,614,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                636,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                598,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                858,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                832,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                40,408,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,542,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                109,381,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                106,322,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                854,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                746,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                14,283,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,992,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                2,830,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,990,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                468,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,125,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,760,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,428,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                27,454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,015,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                2,800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                12,439,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,710,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                750,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                750,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                20,303,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,847,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                47,758,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,862,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                1,137,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,067,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                1,744,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,175,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                8,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                7,408,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,408,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                40,589,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,063,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -453,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -195,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                55,544,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,275,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                280,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                33,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                503,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                397,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                -11,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -108,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                805,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                509,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                5,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                61,623,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                109,381,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                106,322,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |