Consolidated Statement Of Cash Flows
| Concept | 2024-10-01 to 2025-03-31 | As at 2025-03-31 | As at 2024-09-30 | 2023-10-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-09-30 | 
|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | 
                                                389,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                517,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                3,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -151,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -62,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                245,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                455,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                -17,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -44,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -155,423,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -179,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | 
                                                -6,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | 
                                                111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Dividends paid | 
                                                -187,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -156,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -187,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -156,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                -7,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -22,614,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -105,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                97,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                5,848,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,953,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,728,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,631,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |