Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,958,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,779,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                1,145,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                927,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                9,321,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                5,419,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                639,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                211,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -18,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                23,513,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,288,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                5,369,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,325,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,015,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,033,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                480,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                487,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                595,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                606,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                4,222,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,188,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings, net | 
                                                1,454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,503,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,797,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                970,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                883,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Own-used assets | ||
| Other | — | — | 
| Intangible assets | ||
| Intangible assets | 
                                                132,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                102,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                28,882,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,613,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                4,937,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,975,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Notes and accounts payable - trade | 
                                                1,390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                43,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for product warranties | 
                                                92,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                532,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                928,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,456,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                11,591,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,412,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                4,295,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,636,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                68,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                383,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                391,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                417,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                5,190,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,513,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                16,781,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,925,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                12,597,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,102,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                7,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                4,461,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,462,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                2,033,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,543,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -897,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -903,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                -496,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -415,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                176,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                -711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -644,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                12,101,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,687,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                28,882,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,613,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments | ||
| Remeasurements of defined benefit plans | 
                                                44,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |