Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,208,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,276,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                4,205,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,197,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Costs on construction contracts in progress | 
                                                19,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                882,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                925,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                6,491,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,555,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                1,384,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,417,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                222,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                140,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                14,591,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,133,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                2,153,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,227,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Own-used assets | ||
| Land | 
                                                4,107,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,103,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                1,184,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                677,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                7,445,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,008,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                135,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Allowance for doubtful accounts | 
                                                -529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                2,369,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,334,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                9,950,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,495,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                24,541,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,629,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Bonds payable | 
                                                25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                1,843,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,007,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                1,154,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,150,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                57,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                3,425,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,592,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                344,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                350,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Short-term borrowings | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                210,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Notes and accounts payable - trade | 
                                                1,380,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,337,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                224,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                355,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                328,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                331,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of bonds payable | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                234,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                599,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,079,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,837,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,472,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                6,263,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,064,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                17,006,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,658,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                768,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                768,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                600,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                595,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                16,141,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,802,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -503,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -507,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                928,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                583,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                296,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                631,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                524,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                42,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                301,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                279,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                18,278,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,564,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                24,541,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,629,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments |