Statement Of Cash Flows
| Concept | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                -1,155,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,201,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                13,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -1,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -1,156,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,204,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -6,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -7,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from facilities maintenance and investing activities | |||||
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from issuance of bonds | — | 
                                                500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                690,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                432,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Redemption of bonds | — | 
                                                -387,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -87,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -473,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -774,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                1,057,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,530,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,305,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |