Quarterly Consolidated Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                13,283,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,108,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                5,739,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                1,946,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,758,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                1,586,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,596,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                620,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                37,711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                23,499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,467,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                9,933,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,169,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                7,430,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,668,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                6,135,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                1,059,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,233,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                5,140,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                29,698,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                67,410,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                4,550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,652,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                243,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                620,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                4,612,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,661,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                17,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,178,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                2,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                3,754,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,679,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                516,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                9,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,341,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                26,995,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,519,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                5,451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                4,186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                29,833,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,127,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -203,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -203,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                39,268,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,562,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                340,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                223,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                17,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                787,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                807,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,145,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,041,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                40,414,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                67,410,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |