Quarterly Consolidated Balance Sheet
| Concept | As at 2024-05-31 | As at 2024-02-29 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,583,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,011,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                171,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                183,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -6,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,107,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,473,798,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,640,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,638,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                922,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                920,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                717,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                717,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                33,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,267,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,273,047,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Other | 
                                                770,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                782,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -10,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                2,941,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,946,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                6,048,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,419,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                107,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                462,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                512,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,296,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                981,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,115,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                896,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                27,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                448,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                447,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                179,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                191,083,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,905,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,693,805,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,201,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,675,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                547,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                547,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                63,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                2,051,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,983,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -70,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -70,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                2,591,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,523,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                31,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                30,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                61,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                193,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                169,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,847,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,744,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                6,048,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,419,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |