Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                10,985,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,921,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Costs on construction contracts in progress | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise | 
                                                5,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,798,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,242,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                44,163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,347,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                25,140,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,880,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                4,061,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,105,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                304,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                20,774,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,445,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                10,543,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,355,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,017,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,003,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -11,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Intangible assets | ||
| Investments and other assets | ||
| Other assets | ||
| Assets | 
                                                69,303,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,228,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Current portion of long-term borrowings | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                766,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,527,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,377,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,088,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Advances received on construction contracts in progress | 
                                                2,292,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,528,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                16,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,095,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accrued consumption taxes | 
                                                42,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,261,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                1,082,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                971,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses for directors (and other officers) | 
                                                16,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                3,730,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,946,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                35,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                3,116,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                164,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                165,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                19,830,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,042,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Deferred tax liabilities for land revaluation | 
                                                104,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                104,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                42,718,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,712,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                2,746,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,746,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                2,563,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,498,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                39,472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,466,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -2,064,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,999,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                6,754,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,471,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                4,805,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revaluation reserve for land | 
                                                -134,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -134,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                49,472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                69,303,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,228,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Valuation and translation adjustments | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |