Consolidated Balance Sheet
| Concept | As at 2023-11-30 | As at 2023-05-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Non-current assets | ||
| Property, plant and equipment | ||
| Buildings, net | 
                                                384,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                390,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Own-used assets | ||
| Land | 
                                                260,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                260,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                127,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                964,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                911,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                65,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                392,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                384,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                187,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                130,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                182,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                75,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                1,422,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,366,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | ||
| Cash and deposits | 
                                                1,065,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                852,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Notes receivable - trade | 
                                                34,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                941,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                978,426,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Contract assets | 
                                                15,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                551,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                586,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                52,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                403,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                348,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                102,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,658,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,581,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                5,081,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,948,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Non-current liabilities | 
                                                1,412,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                977,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                1,319,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                872,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                26,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,692,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,055,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,104,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,033,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,932,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,896,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                143,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                143,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                672,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                665,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                1,155,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,137,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -39,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -49,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits for subscriptions of treasury shares | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                45,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                45,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,977,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,915,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                5,081,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,948,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Current portion of long-term borrowings | 
                                                404,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                195,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                20,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                198,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                191,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                300,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                303,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Other | 
                                                5,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments |