Semi-Annual Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                4,726,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,654,949,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                5,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                7,342,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,055,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,355,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,292,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Tools, furniture and fixtures | — | — | 
| Tools, furniture and fixtures, net | 
                                                35,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,023,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                963,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                70,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                15,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                46,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                46,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                885,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                700,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                945,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                808,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                44,304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                93,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                16,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                2,347,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,128,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                9,689,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,183,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                137,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                143,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                131,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                128,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,035,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,861,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                496,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                452,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                38,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                2,531,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,314,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for retirement benefits for directors (and other officers) | 
                                                196,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                182,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                56,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                393,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                393,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                283,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                283,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                6,441,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,282,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -158,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -158,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                6,960,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,800,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                198,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                198,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                7,158,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,869,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                9,689,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,183,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |