Semi-Annual Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                10,594,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,529,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                628,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                34,421,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,436,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                12,362,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                4,694,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,786,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                1,387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,636,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                4,344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                160,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                170,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                1,358,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                348,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                569,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                3,810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,046,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                2,054,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,385,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                353,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                420,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                414,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -61,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -61,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                16,521,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,134,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                50,943,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,571,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                527,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                401,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                2,255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,545,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                560,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                392,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                80,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                26,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                372,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                369,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                14,174,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,766,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                14,080,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                161,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                141,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,246,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,645,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                18,024,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,270,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                32,198,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,037,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                477,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                457,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities for land revaluation | 
                                                915,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                915,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                4,304,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,304,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,263,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,263,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                13,558,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,636,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -3,111,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,110,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                16,015,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,093,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                448,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                335,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revaluation reserve for land | 
                                                2,072,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,072,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                23,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                2,729,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,423,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                18,744,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                50,943,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,571,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |