Statement Of Cash Flows [Abstract]
| Concept | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 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 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||
| Profit (loss) | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                175  397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                175  397
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                249  068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                249   068
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | 
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||
| Adjustments for decrease (increase) in inventories | — | — | 
                                                64 333
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                80  450
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Adjustments for depreciation and amortisation expense | — | — | 
                                                139  597
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                126 087
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Other adjustments for non-cash items | — | — | 
                                                4  606
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1 277
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Adjustments for losses (gains) on disposal of non-current assets | — | — | 
                                                2 3 7
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1 754
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Interest paid, classified as operating activities | — | — | 
                                                66  978
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                29  304
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Interest received, classified as operating activities | — | — | 
                                                11 627
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1  845
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Other inflows (outflows) of cash, classified as operating activities | — | — | 
                                                4  74 9
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                2 521
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Cash flows from (used in) operating activities | — | — | 
                                                519 197
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                128 433
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Cash flows from (used in) investing activities [abstract] | |||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | 
                                                213  264
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                –
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | 
                                                187,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                914,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Purchase of property, plant and equipment, classified as investing activities | — | — | 
                                                89  130
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                138  095
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Purchase of intangible assets, classified as investing activities | — | — | 
                                                6  067
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                3 935
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Other inflows (outflows) of cash, classified as investing activities | — | — | 
                                                5  004
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1  104
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Cash flows from (used in) investing activities | — | — | 
                                                313  278
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                140  012
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Cash flows from (used in) financing activities [abstract] | |||||||||||||
| Proceeds from borrowings, classified as financing activities | — | — | 
                                                241  376
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                953 601
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Repayments of borrowings, classified as financing activities | — | — | 
                                                170  168
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                987  702
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Payments of lease liabilities, classified as financing activities | — | — | 
                                                39 752
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                34  316
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Cash flows from (used in) financing activities | — | — | 
                                                69  890
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                169  891
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | 
                                                136  029
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                181  470
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | 
                                                5 427
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                13  940
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | 
                                                308  936
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
                                                178  334
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                345  864
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             |