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 | 
                                                2,471,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,938,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                688,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                839,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                1,341,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                954,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                1,478,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,411,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                245,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                130,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                11,165,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,845,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                2,520,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,574,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                258,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                170,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,928,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,059,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Allowance for doubtful accounts | 
                                                -34,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -34,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                4,707,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,804,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                15,873,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,649,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                2,233,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,501,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                3,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,206,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                104,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                322,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                904,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,034,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                6,573,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,569,861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                1,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                2,127,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,199,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                47,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                220,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                214,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                3,908,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,006,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                10,482,051,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,576,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                700,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                700,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                722,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                722,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                3,616,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,246,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -96,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -96,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                4,942,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,573,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                291,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                156,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                182,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                448,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                500,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                5,390,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,073,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                15,873,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,649,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |