Semi-Annual Consolidated Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,200,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,350,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                34,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                389,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                10,881,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,570,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                7,150,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,694,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                2,054,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,837,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                1,023,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                826,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                4,035,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,949,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                18,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                18,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                146,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                165,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                36,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                182,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                199,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                997,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                896,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                608,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                511,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                127,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -156,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -98,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                8,330,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,789,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                19,212,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,359,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                263,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                264,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                2,531,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,910,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                11,692,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                45,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                819,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                501,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,921,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,542,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,773,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,206,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                109,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                110,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                80,861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                38,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                257,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                2,434,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,035,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                8,356,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,577,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                70,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,790,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                91,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                360,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                317,473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                1,290,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,290,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                1,269,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,269,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                8,253,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,235,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -166,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -166,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                10,647,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,629,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                220,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                154,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                -46,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -36,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                21,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                197,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                11,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                10,856,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,782,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                19,212,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,359,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |