Consolidated Balance Sheet
| Concept | As at 2024-04-30 | As at 2024-01-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Non-current assets | 
                                                14,119,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,246,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                622,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                567,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                423,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                410,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                87,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                111,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | ||
| Cash and deposits | 
                                                5,927,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,759,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                1,060,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,045,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                543,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                687,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                629,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                553,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                180,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                662,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                12,248,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,285,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                13,448,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,630,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,526,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,526,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                336,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                290,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                989,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                800,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                13,009,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,002,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                8,515,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,524,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation and impairment | 
                                                -4,493,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,477,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Own-used assets | ||
| Machinery, equipment and vehicles | 
                                                7,669,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,977,799,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                2,079,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,488,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation and impairment | 
                                                -5,589,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,489,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                6,291,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,064,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation and impairment | 
                                                -5,301,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,264,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                48,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                26,367,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,531,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                467,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                334,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                163,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                448,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                280,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for product warranties | 
                                                22,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,223,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,733,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                4,027,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,183,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                7,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Deferred tax liabilities | 
                                                5,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                239,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                241,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                290,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                287,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                535,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                554,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                4,562,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,737,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                21,650,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,644,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                1,111,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,111,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,303,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,303,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                20,954,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,948,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,718,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,718,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                154,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                149,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                57,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                18,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                21,805,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,793,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                26,367,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,531,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments | ||
| Remeasurements of defined benefit plans | 
                                                78,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                86,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |