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 | 
                                                6,232,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,471,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                386,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                181,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                531,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                678,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -9,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                8,211,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,542,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                644,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                640,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings | — | — | 
| Buildings, net | 
                                                444,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                455,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                200,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                184,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                307,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                342,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Investments and other assets | 
                                                3,152,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,453,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                2,283,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,432,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                180,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                316,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                62,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -36,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -27,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                4,104,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,436,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                12,315,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,978,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                120,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                183,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                146,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                350,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,908,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,512,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,342,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,661,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                183,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                181,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                364,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                360,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,891,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,203,304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                4,800,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,715,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,091,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,079,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                995,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                982,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                6,546,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,750,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,700,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,700,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                6,932,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,111,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                580,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                150,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                580,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                150,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                7,515,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,263,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                12,315,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,978,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |