Consolidated Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                4,939,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,635,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                18,215,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,581,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                486,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                524,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                633,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,591,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -27,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                41,049,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,404,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                19,061,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,083,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                6,741,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,714,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                6,474,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,403,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                269,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                313,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                12,006,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,258,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                313,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                111,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                60,110,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,488,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                6,600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                541,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                156,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                444,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for product warranties | 
                                                508,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                637,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,098,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,579,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                20,741,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,466,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                3,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                2,757,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,798,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,246,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,929,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                9,004,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,728,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                29,745,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,194,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                25,451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,902,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                5,252,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,252,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                3,124,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,124,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                17,180,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -105,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                4,913,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,392,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                2,117,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                2,844,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,074,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                30,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,294,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                60,110,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,488,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments | ||
| Remeasurements of defined benefit plans | 
                                                -48,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -56,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |