Statement Of Cash Flows
| Concept | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | 2021-10-01 to 2022-09-30 | As at 2022-09-30 | As at 2021-09-30 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                378,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                235,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                1,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -1,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||
| Net cash provided by (used in) operating activities | — | 
                                                348,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||
| Cash flows from facilities maintenance and investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -89,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -177,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                42,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -1,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Net cash provided by (used in) investing activities | — | 
                                                -103,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -49,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Repayments of short-term borrowings | — | 
                                                -27,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -46,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -34,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | — | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -211,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -244,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Redemption of bonds | — | 
                                                -100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -286,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -32,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                23,632,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -18,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                111,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,820,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,838,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,727,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |