Semi-Annual Balance Sheet
| Concept | As at 2024-02-29 | As at 2023-05-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                12,220,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,521,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                716,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                591,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -17,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                17,322,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,377,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,670,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,684,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Tools, furniture and fixtures | — | — | 
| Tools, furniture and fixtures, net | 
                                                383,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                414,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                413,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                413,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                129,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                27,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -5,585,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,403,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                454,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                561,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                371,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                522,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                28,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                194,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                182,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,339,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,356,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                690,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                663,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                476,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                531,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -22,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -21,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                3,463,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,602,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                20,786,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,979,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                94,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                135,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                209,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                509,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                840,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,214,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,505,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,300,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                235,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                319,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                249,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                278,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                249,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                265,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,754,861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,579,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,706,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,706,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                1,570,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,458,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                16,249,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,824,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -858,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -882,415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                18,667,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,106,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                28,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                274,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                209,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                19,031,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,400,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                80,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                84,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                20,786,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,979,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |