Semi-Annual Consolidated Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,788,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,019,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                51,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,256,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,219,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                2,539,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,547,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                1,786,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,786,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                191,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                179,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                25,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                317,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                2,882,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,896,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                8,139,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,115,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                483,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                448,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                147,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                172,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                491,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                730,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,700,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,916,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                81,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                483,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                529,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                2,184,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,446,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                137,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                124,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                831,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                831,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                940,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                940,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                4,381,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,122,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -268,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -268,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                5,884,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,625,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                70,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                70,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                5,955,317,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,669,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                8,139,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,115,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |