Consolidated Statement Of Cash Flows
| Concept | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | As at 2021-03-31 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                521,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,702,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                5,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -123,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -123,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                664,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,204,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -431,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -325,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                3,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -253,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -166,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | — | 
                                                1,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -1,283,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | — | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,270,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -1,374,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,262,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -1,764,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -12,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                3,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -1,350,732,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,373,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                2,391,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,742,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,116,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |