Quarterly Consolidated Statement Of Cash Flows
| Concept | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2022-03-31 | 2021-04-01 to 2022-03-31 | 
|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | ||||
| Statement of cash flows | ||||
| Cash flows from operating activities | ||||
| Profit (loss) before income taxes | 
                                                -656,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -549,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Depreciation | 
                                                932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | 
                                                -12,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | 
                                                32,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | 
                                                -626,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | 
                                                353,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | 
                                                110,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | 
                                                127,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | 
                                                -1,381,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | 
                                                12,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | 
                                                -38,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | 
                                                -1,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | 
                                                -1,421,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | ||||
| Purchase of investment securities | 
                                                -50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -28,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | ||||
| Proceeds from long-term borrowings | 
                                                970,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | 
                                                -150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Purchase of treasury shares | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | 
                                                1,356,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -93,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                1,067,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,160,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |