Quarterly Statement Of Cash Flows
| Concept | As at 2024-09-30 | 2024-04-01 to 2024-09-30 | As at 2024-03-31 | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|
| Quarterly statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                317,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                572,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                367,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                348,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | 
                                                -9,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -13,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                116,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -407,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                59,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                291,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -53,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -194,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                120,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                857,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                604,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                8,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -276,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -38,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                588,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                583,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of securities | — | 
                                                -2,001,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -3,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of property, plant and equipment | — | 
                                                -584,262,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -399,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                3,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -521,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -109,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | — | 
                                                298,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                328,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -4,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -706,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -189,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Dividends paid | — | 
                                                -194,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -115,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -203,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -125,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                42,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                28,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -279,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                297,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                5,355,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,634,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,948,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,650,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |