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 | — | 
                                                5,629,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,608,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                54,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                37,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -1,812,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,290,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -9,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -11,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                3,889,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,343,849,000
                                                
                                                    
                                                        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 | — | 
                                                -3,980,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,501,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                2,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Net cash provided by (used in) investing activities | — | 
                                                -4,145,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,510,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -165,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -1,697,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -670,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -2,514,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,485,499,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | 
                                                -800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -31,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -2,802,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,353,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                12,482,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,284,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                13,931,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |