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PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS - Narrative (Details) $ in Millions | Jan. 30, 2026 USD ($) plan | Mar. 31, 2026 USD ($)
--- | --- | ---
Postretirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected future employer contributions, current fiscal year |  | $ 1.8
Qualified Plan | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected future employer contributions, current fiscal year |  | 7.3
Nonqualified Plan | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected future employer contributions, current fiscal year |  | $ 2.7
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 |

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