Consolidated Statement Of Cash Flows
| Concept | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                234,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,084,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                5,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | 
                                                -59,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -441,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -262,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                180,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                648,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -353,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,258,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -378,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,262,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | 
                                                -291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | 
                                                -231,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -231,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -235,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -234,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                6,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -427,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -838,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                2,723,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,150,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,988,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |