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 | — | 
                                                620,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                762,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                52,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -2,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -267,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -256,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                402,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                546,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -26,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -170,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -89,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -9,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -225,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Dividends paid | — | 
                                                -131,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -104,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -164,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -133,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -32,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -28,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -14,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -1,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                525,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,559,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,560,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,035,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |