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 | — | 
                                                397,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                190,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                369,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                372,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | 
                                                -7,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,047,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                14,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                13,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                221,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                133,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                49,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -311,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                124,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -104,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -133,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                207,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                1,114,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                545,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                2,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -15,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -13,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -433,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -140,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                725,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                631,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -294,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -438,423,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                2,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -94,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from collection of loans receivable | — | 
                                                420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                48,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -305,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -509,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Repayments of long-term borrowings | — | 
                                                -399,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -374,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -145,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -86,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -9,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -13,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -533,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -275,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -113,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -153,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                1,299,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,413,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,745,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,899,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |