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Cover
 12 Months Ended
Dec. 31, 2022
shares
Document Information [Line Items]  
Document Type 40-F/A
Document Registration Statement false
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2022
Entity File Number 001-39974
Entity Registrant Name WEST FRASER TIMBER CO. LTD.
Entity Incorporation, State or Country Code A1
Entity Tax Identification Number 98-1630330
Entity Address, Address Line One 1500 – 885 West Georgia Street
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Country CA
Entity Address, Postal Zip Code V6C 3E8
City Area Code 604
Local Phone Number 895-2700
Title of 12(b) Security Common Shares, no par value
Trading Symbol WFG
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Entity Central Index Key 0001402388
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Amendment Flag true
Amendment Description West Fraser Timber Co. Ltd. (“West Fraser”) is filing this Amendment No. 2 (the “Amendment No. 2”) to its original Annual Report on Form 40-F for the year ended December 31, 2022 (the “Original 2022 Annual Report”) filed with the Securities and Exchange Commission (the “SEC”) on February 14, 2023 and its Amendment No. 1 to the Original 2022 Annual Report filed with the SEC on July 21, 2023 in order to provide further updated certifications of West Fraser’s Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”) pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. The updated CEO and CFO certifications are filed as Exhibits 99.4 and 99.5 to this Amendment No. 2. This Amendment No. 2 consists of a cover page, this explanatory note, the signature page, the exhibit index and the updated CEO and CFO officer certifications filed as Exhibits 99.4 and 99.5. Other than expressly set forth herein, this Amendment No. 2 does not, and does not purport to, amend or restate any other information contained in the Original 2022 Annual Report nor does this Amendment No. 2 reflect any events that have occurred after the Original Annual Report was filed.
Share capital  
Document Information [Line Items]  
Number of shares issued 83,555,414
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 1900 Exeter Road
Entity Address, City or Town Germantown
Entity Address, State or Province TN
Entity Address, Postal Zip Code 38138
City Area Code 901
Local Phone Number 620-4200
Contact Personnel Name West Fraser, Inc.
Entity Address, Address Line Two Suite 105