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 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                428,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                366,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                10,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -65,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -60,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -19,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -32,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                370,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | |||||
| Cash flows from operating activities | |||||
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -750,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -566,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -103,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -846,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -473,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | — | 
                                                1,205,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                940,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                617,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                220,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -742,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -872,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -4,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                136,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                133,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,802,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,665,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,531,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |