Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2024-10-01 to 2025-03-31 | As at 2025-03-31 | As at 2024-09-30 | 2023-10-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-09-30 | 
|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | 
                                                71,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                59,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                50,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                -117,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -57,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                4,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                40,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                3,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -107,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -28,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Proceeds from long-term borrowings | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | 
                                                -87,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -87,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -46,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -46,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -36,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                63,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                16,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -68,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                93,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                1,984,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,052,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,913,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,820,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |