Consolidated Balance Sheet
| Concept | As at 2024-09-20 | As at 2024-03-20 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,424,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,342,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Supplies | 
                                                12,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                51,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,877,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,646,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Buildings and structures | 
                                                7,314,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,310,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -5,205,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,111,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                2,109,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,198,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Own-used assets | ||
| Machinery, equipment and vehicles | 
                                                1,263,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,292,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -1,182,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,214,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                81,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                3,111,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,111,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                396,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                391,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -325,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -312,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                71,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                5,374,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,466,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                47,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Investments and other assets | ||
| Investment securities | 
                                                333,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                171,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                192,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                555,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                573,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Guarantee deposits | 
                                                51,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                5,977,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,096,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                9,855,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,742,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,799,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,889,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                49,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                199,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                72,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,964,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,207,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Income taxes payable | 
                                                74,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                180,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                180,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                170,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                172,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                549,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                460,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,284,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,164,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                12,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,249,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,372,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                6,497,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,263,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                1,140,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,140,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,120,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,120,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                4,270,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,036,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -32,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -32,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                108,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                106,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                108,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                106,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,606,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,370,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                9,855,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,742,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments |