Quarterly Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                5,310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,761,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                2,319,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,007,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                4,586,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,638,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                695,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,264,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                21,874,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,020,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                16,074,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,225,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                3,083,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,019,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                5,068,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,860,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                6,018,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                165,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                507,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                219,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                1,519,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,644,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                118,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                259,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                242,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                2,138,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,908,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                1,012,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                860,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                290,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                258,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                912,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                883,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                18,471,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                40,346,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,397,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                3,691,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,155,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                3,778,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,647,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                231,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,145,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,027,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                17,220,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,468,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,489,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,401,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                3,173,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,265,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                142,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                5,383,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                22,604,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,819,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                2,163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,151,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,882,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,870,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                6,758,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,015,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                10,749,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,981,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                127,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                1,650,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                905,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                52,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,830,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                979,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                5,162,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,617,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                17,741,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,578,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                40,346,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,397,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |