Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Non-current assets | 
                                                2,844,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,896,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                290,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | ||
| Cash and deposits | 
                                                3,026,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,019,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Notes and accounts receivable - trade | 
                                                1,641,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,410,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                357,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                404,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                117,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                384,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                274,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                16,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,543,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,219,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                2,532,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,547,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings, net | 
                                                564,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                581,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,786,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,786,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                181,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                179,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Own-used assets | ||
| Other | — | — | 
| Intangible assets | ||
| Intangible assets | 
                                                21,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                8,387,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,115,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                585,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                448,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                540,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                45,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                172,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                63,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                124,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                618,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                730,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,852,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,916,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                72,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                351,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                529,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                2,204,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,446,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                6,113,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,625,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                831,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                831,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                940,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                940,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                4,588,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,122,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -247,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -268,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                69,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                69,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,182,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,669,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                8,387,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,115,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments |