Quarterly Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                10,253,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,099,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                753,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                536,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                23,407,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,405,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                4,434,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,436,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                3,080,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,055,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                1,354,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,380,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                346,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                3,734,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,795,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                3,299,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,379,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                21,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -33,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -33,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                8,512,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,578,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                31,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,984,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                1,155,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                24,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                788,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                990,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                6,096,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,474,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Retirement benefit liability | 
                                                36,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                257,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                357,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                6,353,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,832,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                127,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                24,199,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,646,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,009,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,013,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                24,127,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,566,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                1,547,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                -13,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                -77,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                -18,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,438,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,585,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                25,566,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,151,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                31,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,984,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |