Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                190,502,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                225,039,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                41,378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,209,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                56,663,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                56,549,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -275,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -226,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                389,601,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                414,509,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Investments and other assets | 
                                                235,737,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                232,716,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Deferred tax assets | 
                                                50,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,075,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                39,532,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,927,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -139,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,411,771,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,440,926,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,801,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,855,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                28,302,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,645,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                47,551,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,883,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                884,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,133,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                70,773,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,875,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                259,371,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                290,161,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                613,700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                639,900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                444,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                449,903,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                34,137,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,904,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                76,660,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,997,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,172,598,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,235,115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Reserves under special laws | ||
| Reserves under special laws | 
                                                2,684,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,434,654,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,527,982,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                117,641,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                117,641,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                33,375,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,987,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                181,669,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,153,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -3,135,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                329,550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                287,403,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                10,330,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                3,649,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,623,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                883,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                547,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                3,125,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,318,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                17,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,486,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                19,178,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,563,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                366,718,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                327,453,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,801,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,855,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |