Quarterly Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,035,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,119,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                6,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                86,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                2,215,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,345,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                271,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Investments and other assets | 
                                                83,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                92,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                354,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                115,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                2,569,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,461,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                67,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                111,156,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                681,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                703,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                681,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                703,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                441,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                441,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                580,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                580,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                865,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                736,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -30,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -30,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,888,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,758,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,888,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,758,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                2,569,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,461,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |