Quarterly Consolidated Statement Of Cash Flows
| Concept | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | — | 
                                                500,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                456,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                235,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                234,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in allowance for doubtful accounts | — | 
                                                -236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | 
                                                -75,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -66,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                -379,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                900,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                -24,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -344,712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                185,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -352,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                513,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                787,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                63,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                56,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -158,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -99,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                414,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                740,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -203,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -249,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -229,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | — | 
                                                160,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                128,790,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -42,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -352,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -66,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -169,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -169,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -186,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -191,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                185,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                196,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                2,588,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,402,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,206,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |