v3.25.4
The Company and Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2025
Mill
Summary Of Significant Accounting Policies [Line Items]  
Number of pulp mills 4
Ownership percentage in subsidiaries 100.00%
Net actuarial gain (loss) percent that is exceeded for amortization 10.00%
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true
Accounting Standards Update [Extensible Enumeration] us-gaap:AccountingStandardsUpdate202309Member
Performance Share Units  
Summary Of Significant Accounting Policies [Line Items]  
Vesting period 3 years
Restricted Shares and Equity DSUs  
Summary Of Significant Accounting Policies [Line Items]  
Vesting period 1 year
RSUs  
Summary Of Significant Accounting Policies [Line Items]  
Vesting period 3 years
DSUs | Maximum  
Summary Of Significant Accounting Policies [Line Items]  
Vesting period 1 year
Canada  
Summary Of Significant Accounting Policies [Line Items]  
Number of pulp mills 2
Germany  
Summary Of Significant Accounting Policies [Line Items]  
Number of pulp mills 2
Number of sawmills 1
Number of timber processing and value-add pallet production facility 1
MPR - CPP | West Fraser  
Summary Of Significant Accounting Policies [Line Items]  
Ownership percentage disposed 50.00%