Quarterly 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 | 
|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                -421,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -94,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | 
                                                265,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                268,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest expenses | — | 
                                                16,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in trade receivables | — | 
                                                213,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                63,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Decrease (increase) in inventories | — | 
                                                58,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -111,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Increase (decrease) in trade payables | — | 
                                                -55,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -233,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                165,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                140,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Subtotal | — | 
                                                117,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -76,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | — | 
                                                -20,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -11,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | — | 
                                                -4,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -3,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                108,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                110,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -137,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -280,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | — | 
                                                -6,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -14,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -189,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -434,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | ||||||
| Proceeds from long-term borrowings | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                320,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | 
                                                -425,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -487,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from issuance of shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,351,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -707,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,170,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -16,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -18,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -804,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                828,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                1,275,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,080,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,558,051,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                729,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |