Quarterly Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                5,267,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,634,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                2,087,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,100,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                1,316,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,153,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                516,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                571,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                289,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                245,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                15,720,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,029,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                4,680,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,673,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                828,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                818,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                336,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                287,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                55,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Investments and other assets | 
                                                1,138,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                886,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                845,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                598,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                293,278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                288,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                5,874,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,629,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                21,595,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,659,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                2,030,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,825,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                642,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,139,632,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,314,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,493,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Asset retirement obligations | 
                                                127,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                14,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                921,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                903,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                6,236,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,396,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| 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 | 
                                                7,395,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,360,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -48,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -48,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                14,624,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,589,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                94,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                150,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                734,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                673,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                15,359,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,262,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                21,595,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,659,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |