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v3.24.3

Basis of Presentation - Debt Issuance and Redemption (Details) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2024 USD ($) | Apr. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) | Oct. 31, 2026 | Sep. 28, 2024 USD ($) | Sep. 30, 2023 USD ($) | Oct. 31, 2027 | Oct. 31, 2026 | Oct. 31, 2025 | Oct. 31, 2029 | Mar. 29, 2027 | Dec. 31, 2026 | Sep. 26, 2026 | Jun. 27, 2026 | Mar. 28, 2026 | Dec. 31, 2025 | Sep. 27, 2025 | Jun. 28, 2025 | Mar. 29, 2025 | Jan. 31, 2024 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  |  |  |  | $ 232,200,000 | $ 303,217,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Asset-Based Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity | $ 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | Subsequent Event | Asset-Based Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Term Loan | Secured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt | $ 683,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payments | $ 1,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Term Loan | Secured Debt | Subsequent Event | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured net leverage ratio | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Term Loan | Secured Debt | Subsequent Event | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured net leverage ratio | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Term Loan | Secured Debt | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance fees |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured net leverage ratio |  |  | 5.00 |  |  |  |  |  |  |  | 4.50 | 4.75 | 4.75 | 4.75 | 4.75 | 5.00 | 5.00 | 5.00 | 5.00 |
2029 Term Loan | Secured Debt | Subsequent Event | Forecast | Voluntary prepayments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of premium prepayment |  |  |  | 2.00% |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Term Loan | Secured Debt | Subsequent Event | Forecast | Prepayments from sales proceeds of Paperboard and High-Yield Pulp businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of premium prepayment |  |  |  |  |  |  |  | 1.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |
7.625% Senior Secured Notes due January 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ (1,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7.625% Senior Secured Notes due January 2026 | Senior Notes | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of long-term debt |  |  | $ 453,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Term Loan | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Basis spread |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Term Loan | Secured Debt | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of long-term debt |  |  | $ 246,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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