v3.26.1
PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS - Narrative (Details)
$ in Millions
 6 Months Ended
Jan. 30, 2026
USD ($)
plan
Jun. 30, 2026
USD ($)
Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, contributions by employer   $ 0.4
Expected future employer contributions, remainder of fiscal year   1.4
Qualified Plan | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, contributions by employer   2.1
Expected future employer contributions, remainder of fiscal year   5.2
Nonqualified Plan | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, contributions by employer   1.1
Expected future employer contributions, remainder of fiscal year   $ 1.6
PotlatchDeltic | Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Number of defined benefit pension plans acquired | plan 2  
Discount rate for measure the projected benefit obligation 5.50%  
Other postretirement accumulated benefit obligation $ 14.0  
PotlatchDeltic | Qualified Plan | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Number of defined benefit pension plans acquired | plan 1  
Weighted-average expected long-term rate of return on plan assets (as a percent) 6.50%  
Discount rate for measure the projected benefit obligation 5.65%  
Plan assets, amount $ 181.0  
Benefit obligation $ 197.0  
PotlatchDeltic | Nonqualified Plan | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Number of defined benefit pension plans acquired | plan 2  
Discount rate for measure the projected benefit obligation 5.65%  
Benefit obligation $ 33.9