Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | 
                                                4,036,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,787,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and deposits | 
                                                1,597,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,398,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                1,116,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,042,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                54,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                111,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Land | 
                                                1,998,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,643,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                3,117,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,605,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                22,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Own-used assets | ||
| Intangible assets | ||
| Intangible assets | 
                                                15,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                15,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other intangible assets | ||
| Investments and other assets | ||
| Investments and other assets | 
                                                404,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                415,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                404,979,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                415,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                3,538,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,032,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Current assets | ||
| Other assets | ||
| Assets | 
                                                7,575,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,819,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                610,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                510,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                150,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                42,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                394,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                280,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,039,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,935,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                68,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                117,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                1,253,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                794,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                630,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                188,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                169,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                165,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term accounts payable - other | 
                                                9,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,293,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,730,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                4,248,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,065,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                186,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                186,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                145,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                3,918,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,735,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                33,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                33,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                4,281,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,089,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,575,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,819,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Valuation and translation adjustments | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |