Quarterly Consolidated Statement Of Cash Flows
| Concept | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | 2022-03-01 to 2023-02-28 | As at 2023-02-28 | As at 2022-02-28 | 
|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | 
                                                -1,281,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -116,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                32,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                -21,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -82,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividend income | 
                                                -14,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -16,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | 
                                                703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                12,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                198,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | 
                                                1,021,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                215,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                -82,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                54,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                -415,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                438,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                14,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -1,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                -398,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                536,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -4,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -114,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -76,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from short-term borrowings | 
                                                547,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of short-term borrowings | 
                                                -797,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -207,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | 
                                                -29,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -55,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -72,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -250,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                92,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -763,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                552,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                883,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,646,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,094,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |