Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                8,838,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,448,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                264,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                249,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -182,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -184,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                18,971,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,978,618,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                5,611,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,169,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                9,388,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,983,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -6,621,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,543,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                2,767,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,440,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                11,466,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,031,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -10,031,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,854,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                1,435,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,176,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                944,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                933,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                364,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                536,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                926,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                884,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -825,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -802,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                100,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                82,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                273,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                276,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                8,717,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,891,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                6,607,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,368,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                53,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                677,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                164,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -8,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -76,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                14,601,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,338,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                33,573,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,316,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                1,386,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,382,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                3,032,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,264,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                1,189,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,199,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                283,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                291,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                920,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                696,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                7,137,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,114,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                36,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                141,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                4,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                2,170,499,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,402,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                9,308,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,516,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                54,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                59,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                345,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                389,739,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                1,792,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,035,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                640,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                640,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                289,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                289,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                17,520,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,836,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -9,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                18,441,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,757,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                3,190,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,702,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                1,086,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                839,430,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                708,499,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                746,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                4,985,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,288,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                837,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                754,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                24,264,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,799,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                33,573,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,316,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |