Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | 
                                                15,475,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,677,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and deposits | 
                                                4,948,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,650,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                2,100,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                219,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                261,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Land | 
                                                816,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                809,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                4,475,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,405,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                397,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                336,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Own-used assets | ||
| Intangible assets | ||
| Intangible assets | 
                                                88,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                868,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,009,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,181,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,322,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                313,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                313,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                5,745,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,824,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Current assets | ||
| Finished goods | 
                                                250,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                264,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                1,211,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,172,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                556,415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                577,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | ||
| Assets | 
                                                21,220,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,502,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Non-current liabilities | 
                                                962,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                954,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                28,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                127,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                87,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                84,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,389,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,115,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                941,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                691,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Provision for bonuses | 
                                                205,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                141,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Liabilities | 
                                                6,352,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,069,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                14,283,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,000,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                3,779,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,779,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                3,498,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,498,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                7,055,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,771,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -48,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -48,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                584,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                432,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                150,430,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                14,868,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,433,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                21,220,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,502,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings | ||
| Valuation and translation adjustments |