Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-12-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,723,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,007,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Notes receivable - trade | 
                                                4,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                2,530,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,083,981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                433,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                320,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                55,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                452,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                490,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                350,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                339,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                7,548,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,271,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                5,634,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,648,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                5,401,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,410,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,639,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,639,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                31,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                50,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                396,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                395,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -303,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -299,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated impairment | 
                                                -42,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -42,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                20,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                19,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                211,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                212,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                84,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                53,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                75,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Own-used assets | ||
| Leased assets | 
                                                12,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -6,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated impairment | 
                                                -6,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other intangible assets | ||
| Investments and other assets | ||
| Other assets | ||
| Assets | 
                                                13,182,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,919,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Non-current liabilities | 
                                                1,809,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,077,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                1,587,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,831,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                21,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,265,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,680,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                725,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                725,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                434,284,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                354,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                43,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                114,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                116,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                7,074,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,758,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                6,105,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,161,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                2,518,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,518,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                3,578,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,578,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                492,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                548,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -483,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -483,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                2,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                2,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,108,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,161,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                13,182,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,919,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Provision for retirement benefits for directors (and other officers) | 
                                                12,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Provision for bonuses | 
                                                45,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,288,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings | ||
| Valuation and translation adjustments |