Statement Of Cash Flows
| Concept | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2022-09-30 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                37,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                277,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -5,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -66,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                51,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                210,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from facilities maintenance and investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -59,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -110,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                20,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Net cash provided by (used in) investing activities | — | 
                                                -67,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -112,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -59,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -36,193,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -26,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -36,193,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -85,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -51,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                12,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                762,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                814,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                801,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |