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 | 
                                                23,193,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,182,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                389,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                432,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -17,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                41,757,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,773,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                12,942,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,305,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                23,702,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,844,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -15,750,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -13,617,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                7,951,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,226,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                439,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                366,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -290,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -244,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                121,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,061,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,043,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                199,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                187,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                2,206,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                2,206,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                23,911,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,281,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                15,051,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,267,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                1,232,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,363,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                69,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,413,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,495,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -54,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                39,060,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,937,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                80,817,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                6,346,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,650,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                445,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                92,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                2,148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,052,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                938,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,110,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                33,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,967,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,575,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                18,856,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,673,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                2,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,899,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                1,911,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                294,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                964,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                905,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,886,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                8,176,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,952,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                27,032,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,625,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                516,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                494,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                348,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                596,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                11,412,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,412,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                11,118,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,058,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                27,513,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,797,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,750,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                48,247,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,889,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                2,663,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,885,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                2,586,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,031,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                11,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                5,261,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,940,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                276,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                256,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                53,784,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,086,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                80,817,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |