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 | 
                                                25,260,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,175,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                2,301,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                6,455,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,935,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                383,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                771,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                315,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,235,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                71,882,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                13,610,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,663,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                30,066,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,572,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -20,821,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,489,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                9,245,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,082,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                9,079,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,401,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -6,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,308,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                2,978,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,092,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                119,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | 
                                                150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -79,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -63,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                70,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                825,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,086,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                173,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                216,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                584,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                604,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,211,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                1,353,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,984,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                225,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                214,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                15,798,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,478,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                87,680,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,887,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                14,811,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                3,750,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,750,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                473,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,684,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,088,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                846,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                39,662,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,995,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                2,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                6,107,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,380,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                67,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                11,969,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,885,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                51,632,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,880,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                6,761,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,761,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                6,939,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,037,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                23,843,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,944,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -2,074,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,998,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                35,470,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,745,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Foreign currency translation adjustment | 
                                                734,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                535,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                -156,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -274,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                578,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                261,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                36,048,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,007,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                87,680,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,887,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |