Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                73,967,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,738,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                5,173,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,467,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                132,252,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,901,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                22,693,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                3,184,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,441,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                1,079,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                235,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                2,241,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                17,624,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,464,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                5,274,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                4,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,740,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                958,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                935,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                45,591,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,939,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                177,843,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                186,840,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                3,496,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,817,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,001,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                37,368,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,094,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Lease liabilities | 
                                                1,846,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,042,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                349,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                346,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                334,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                2,541,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,726,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                39,909,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,820,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                32,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,656,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits for subscriptions of shares | 
                                                8,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                32,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,656,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                70,723,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,604,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                136,512,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                128,998,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Foreign currency translation adjustment | 
                                                1,422,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,022,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,422,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,022,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                137,934,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                131,020,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                177,843,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                186,840,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |