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 | 
                                                1,634,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,584,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                983,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,039,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                76,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,894,949,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,077,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                3,150,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,040,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                984,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,027,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,978,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,978,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                187,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                14,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                14,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                467,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                464,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Other | 
                                                468,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                464,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                3,633,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,520,327,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                7,527,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,598,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                759,598,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                822,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                610,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                510,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                64,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                327,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                366,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,029,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,089,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                545,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                595,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                443,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                437,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                172,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                169,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,171,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,211,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,200,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,301,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                128,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                128,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                186,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                186,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                145,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                3,953,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,921,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                4,283,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,251,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                44,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                44,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                4,327,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,297,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,527,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,598,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |