Semi-Annual Balance Sheet
| Concept | As at 2025-03-31 | As at 2024-09-30 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                32,600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,396,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                1,999,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,997,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,322,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                989,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -30,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                72,250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,241,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                36,449,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,367,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                15,168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,903,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                23,110,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,723,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Goodwill | 
                                                9,652,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,855,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                13,458,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,868,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                10,944,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,997,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                11,965,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,072,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,223,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -69,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -67,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                71,526,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,262,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                143,777,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                144,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                6,227,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                1,236,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,498,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,665,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,654,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                12,485,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,771,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                9,788,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,051,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                68,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,446,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,481,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                22,274,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,822,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses | 
                                                1,151,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,004,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                655,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                840,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses for directors (and other officers) | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                5,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | ||
| Capital surplus | 
                                                7,518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,513,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                92,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -3,536,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,556,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                101,772,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,991,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                5,626,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,304,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                19,352,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,327,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                121,502,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,681,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                377,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                362,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                143,777,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                144,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |