Consolidated Statement Of Cash Flows
| Concept | As at 2024-12-31 | 2024-07-01 to 2024-12-31 | As at 2024-06-30 | As at 2023-12-31 | 2023-07-01 to 2023-12-31 | As at 2023-06-30 | 
|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                2,396,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,737,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                1,213,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                994,063,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividend income | — | 
                                                -12,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                21,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in retirement benefit liability | — | 
                                                15,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in provision for bonuses | — | 
                                                23,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Loss (gain) on sale of property, plant and equipment | — | 
                                                -13,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                3,476,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,274,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                143,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                450,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                -1,002,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -250,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -487,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -533,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                2,981,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,725,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                1,212,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,195,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -455,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                157,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | — | 
                                                14,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -21,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -23,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Payments into time deposits | — | 
                                                -182,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -144,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from withdrawal of time deposits | — | 
                                                182,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                144,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of property, plant and equipment | — | 
                                                -1,370,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -840,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                11,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -1,346,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -805,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of investment securities | — | 
                                                -10,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of investment securities | — | 
                                                37,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                72,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -73,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -38,047,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Purchase of treasury shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -49,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in short-term borrowings | — | 
                                                328,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -105,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | — | 
                                                -658,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -429,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid to non-controlling interests | — | 
                                                -275,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -207,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | 
                                                -300,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -331,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -906,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,073,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                16,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -101,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                744,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,745,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                6,467,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,723,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,957,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,211,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |