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 | 
                                                141,466,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,454,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                7,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -11,492,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                152,589,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                147,712,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                996,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,146,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                1,189,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                620,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                30,740,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,835,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                29,775,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,869,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -53,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -79,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                32,927,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,602,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                185,516,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                179,314,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                2,725,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,324,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                7,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                34,741,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,227,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Asset retirement obligations | 
                                                319,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                319,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                6,874,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,298,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                41,616,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,525,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                2,312,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,911,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                40,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                10,519,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,519,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                18,438,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,429,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                102,336,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,863,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -222,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -224,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                131,070,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,588,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                12,829,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,200,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                12,829,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,200,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                143,900,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,788,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                185,516,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                179,314,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |