Statement Of Cash Flows
| Concept | 2024-03-01 to 2024-08-31 | As at 2024-08-31 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | 2022-03-01 to 2023-02-28 | As at 2023-02-28 | As at 2022-02-28 | 
|---|---|---|---|---|---|---|---|
| Statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Subtotal | 
                                                980,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,876,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,016,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -31,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -60,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -49,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -406,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -152,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -432,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||||
| Net cash provided by (used in) operating activities | 
                                                553,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,798,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,267,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||||
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | 
                                                -427,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -415,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -302,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                5,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -445,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -591,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -386,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -6,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -20,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||||
| Cash flows from financing activities | |||||||
| Dividends paid | 
                                                -320,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Proceeds from issuance of bonds | 
                                                581,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,768,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | 
                                                1,006,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,388,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | 
                                                -1,139,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,634,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,687,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -320,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,072,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                106,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Redemption of bonds | 
                                                -400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -332,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -205,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -213,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,279,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                987,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                6,283,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,497,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,217,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,229,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |