Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                -391,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -767,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                68,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -11,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -13,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                -418,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -794,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -119,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -17,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | 
                                                -3,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -646,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -122,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -11,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||
| Proceeds from issuance of bonds | 
                                                200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | 
                                                -68,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -135,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Redemption of bonds | 
                                                -200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from issuance of shares | 
                                                1,056,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,136,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                985,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                932,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                29,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                28,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                474,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                154,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                947,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                473,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                318,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |