Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                35,845,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,696,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Costs on construction contracts in progress | 
                                                1,486,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                726,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -9,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -99,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                133,332,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                112,090,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                5,342,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,366,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                8,332,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,396,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                1,394,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                20,277,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,160,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                37,890,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -107,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -107,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,681,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,625,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                47,617,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,462,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | ||
| Assets | 
                                                180,950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,553,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Long-term borrowings | 
                                                499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                369,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                5,791,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                4,139,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,153,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                58,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term accounts payable - other | 
                                                2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                78,095,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,895,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                22,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,788,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                2,361,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,336,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits received | 
                                                13,958,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,894,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,289,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,072,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                99,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Advances received on construction contracts in progress | 
                                                2,505,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,531,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits received | ||
| Provisions | ||
| Provision for bonuses | 
                                                3,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                32,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                83,886,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,565,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                85,002,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,577,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                4,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                4,837,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,837,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                78,751,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -3,065,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,099,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                11,810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,177,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                7,049,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,754,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                97,063,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                93,987,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                180,950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,553,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings | ||
| Valuation and translation adjustments |