Statement Of Cash Flows [Abstract]
| Concept | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | As at 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | 2021-01-01 to 2021-12-31 | As at 2020-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||
| Profit (loss) | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                38,523,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                39,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                38,484,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                38,484,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                9,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                27,129,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
                                                27,129,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                27,120,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||||
| Adjustments for fair value losses (gains) | — | — | — | 
                                                25,991,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Adjustments for losses (gains) on disposal of non-current assets | — | — | — | 
                                                418,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                539,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Other adjustments to reconcile profit (loss) | — | — | — | 
                                                19,365,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                24,721,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Income taxes paid (refund), classified as operating activities | — | — | — | 
                                                2,124,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                2,023,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | — | — | — | 
                                                600,961,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                289,866,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||
| Other cash payments to acquire equity or debt instruments of other entities, classified as investing activities | — | — | — | 
                                                654,515,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                224,349,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — | 
                                                405,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                624,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | 
                                                4,228,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                6,958,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Cash flows from (used in) investing activities | — | — | — | 
                                                658,338,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                230,683,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||
| Payments of lease liabilities, classified as financing activities | — | — | — | 
                                                13,269,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                13,416,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Interest paid, classified as financing activities | — | — | — | 
                                                914,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                721,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Cash flows from (used in) financing activities | — | — | — | 
                                                14,183,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                14,137,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — | 
                                                71,560,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                45,046,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                2,071,158,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                2,142,718,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,097,672,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             |