Consolidated Balance Sheet
| Concept | As at 2024-02-29 | As at 2023-05-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Non-current assets | 
                                                7,968,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,382,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                3,550,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,422,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                984,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                870,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                400,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                351,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                369,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                379,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | ||
| Cash and deposits | 
                                                3,595,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,930,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Notes and accounts receivable - trade | 
                                                2,002,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,132,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                3,073,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,992,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                1,057,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,263,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                533,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                577,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                1,350,799,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,442,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                233,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                12,671,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,251,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                4,350,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,880,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,246,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,243,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                162,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                194,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                123,501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                467,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                109,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                88,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                2,143,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,303,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Own-used assets | ||
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                564,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                584,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Other | — | — | 
| Intangible assets | ||
| Other intangible assets | ||
| Other | 
                                                67,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                67,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                20,639,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,634,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                588,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                514,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                454,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                284,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                25,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                451,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                90,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                117,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                171,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                578,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                553,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,763,598,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,042,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                252,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                342,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                12,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                721,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                736,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,093,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,259,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                106,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                106,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,856,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,301,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                15,725,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,424,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                2,623,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,623,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                3,092,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,092,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                10,643,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,343,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -634,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -634,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                967,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                817,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                165,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                190,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                788,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                615,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                90,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                16,783,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,332,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                20,639,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,634,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments | ||
| Remeasurements of defined benefit plans | 
                                                13,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |