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 | — | 
                                                476,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                464,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                3,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -8,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -165,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -100,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                305,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                359,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -314,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -569,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                500,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -4,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                175,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -577,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from long-term borrowings | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -447,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -135,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -64,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -60,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -513,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                403,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -32,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,517,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,550,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,364,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |