Consolidated Balance Sheet
| Concept | As at 2025-02-28 | As at 2024-08-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,879,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,034,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                115,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Contract assets | 
                                                18,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Supplies | 
                                                2,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                30,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                249,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -23,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -25,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                2,423,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,788,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                645,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                523,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                612,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                499,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                416,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                396,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -4,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                200,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                28,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                4,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                3,068,426,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,311,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Non-current liabilities | 
                                                82,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                97,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                25,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                210,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                357,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                106,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                175,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                293,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                454,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                2,628,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,732,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                649,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                649,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                630,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                630,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                1,448,598,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,552,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -100,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -100,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                146,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                124,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                91,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                54,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,774,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,857,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                3,068,426,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,311,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Other | 
                                                56,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,718,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Income taxes payable | 
                                                5,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                5,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                5,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                83,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                146,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                1,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments |