Quarterly 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 | 
|---|---|---|---|---|---|
| Quarterly statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                142,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                675,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                8,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -57,658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                93,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                660,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of securities | — | 
                                                -400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of property, plant and equipment | — | 
                                                -8,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -26,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -472,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -167,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -500,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -57,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -73,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                167,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                2,529,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,603,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,435,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |