Semi-Annual Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                690,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                660,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                113,473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                97,798,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                7,687,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,498,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                4,378,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,295,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Machinery and equipment | 
                                                8,339,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,484,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -7,442,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,457,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery and equipment, net | 
                                                896,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,027,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Vehicles | 
                                                33,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -30,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -35,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Vehicles, net | 
                                                3,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Tools, furniture and fixtures | 
                                                678,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                664,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -632,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -617,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Tools, furniture and fixtures, net | 
                                                45,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                972,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                972,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | 
                                                17,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -12,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                4,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                462,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                235,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                275,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                231,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                191,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | 
                                                1,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                2,720,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,827,284,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                2,759,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,874,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Distressed receivables | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                38,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                7,372,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,445,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                15,060,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,944,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                4,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                78,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                355,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                331,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,721,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,834,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                3,202,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,093,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                2,077,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,953,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                1,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                18,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                42,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                8,923,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,927,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses | 
                                                49,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                102,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                796,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                828,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                738,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                738,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                245,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                245,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                2,643,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,501,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -41,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -44,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,585,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,441,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                1,591,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,666,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,591,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,666,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,137,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,016,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                24,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                15,060,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,944,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |