Semi-Annual Consolidated Statement Of Cash Flows
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                170,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,207,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                13,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -1,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -3,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -139,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                178,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,080,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -220,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -80,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -332,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -104,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Dividends paid | — | 
                                                -433,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -434,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -444,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -493,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                116,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -481,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                546,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                4,813,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,294,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,748,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |