Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | 
                                                537,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                375,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | 
                                                577,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                432,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | 
                                                -6,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | 
                                                251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Foreign exchange losses (gains) | 
                                                407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -6,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in provision for bonuses | 
                                                27,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -15,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Loss (gain) on sale of property, plant and equipment | 
                                                -1,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | 
                                                -1,314,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -204,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | 
                                                -1,518,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -293,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | 
                                                2,816,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -612,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | 
                                                -366,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | 
                                                815,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                28,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                5,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                27,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | 
                                                -95,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -450,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                725,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -422,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -324,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -290,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | 
                                                2,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | 
                                                -214,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -631,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -396,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Dividends paid | 
                                                -521,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -312,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -524,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -312,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                -407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -430,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,124,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                7,058,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,489,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,614,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |