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CONTINGENCIES - Additional Information (Detail) ft³ in Millions, $ in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 12, 2019 USD ($) | Oct. 10, 2018 mi | Jun. 30, 2018 USD ($) Company | May 17, 2017 Hazardous_Substance | Mar. 31, 2017 Company | Mar. 31, 2016 USD ($) age mi | Mar. 04, 2016 mi ft³ | Apr. 11, 2014 mi | Apr. 30, 2015 mi | May 31, 2007 Company mi | Jan. 02, 2021 USD ($) site | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Superfund sites | site |  |  |  |  |  |  |  |  |  |  | 28 |  |
Environmental remediation costs, reserve |  |  |  |  |  |  |  |  |  |  | $ 46.7 | $ 57.8 |
Environmental remediation costs deemed probable and reasonable estimable |  |  |  |  |  | $ 1,400.0 |  |  |  |  |  |  |
Reserve for environmental loss contingencies, EPA funded amount |  |  |  |  |  |  |  |  |  |  | $ 15.9 |  |
Environmental remediation. period construction of treatment facility to be maintained |  |  |  |  |  |  |  |  |  |  | 30 years |  |
Number of miles of river | mi |  | 9 |  |  |  | 8.3 | 8.3 | 8.3 | 17 | 17 |  |  |
Cubic yards of settlement | ft³ |  |  |  |  |  |  | 3.5 |  |  |  |  |  |
Approximate implementation time |  |  |  |  |  | 6 years |  |  |  |  |  |  |
Number of parties notified | age |  |  |  |  |  | 105 |  |  |  |  |  |  |
Number of companies offered cash out settlements | Company |  |  |  |  | 20 |  |  |  |  |  |  |  |
Number of hazardous substances | Hazardous_Substance |  |  |  | 8 |  |  |  |  |  |  |  |  |
Number of defendants | Company |  |  | 100 |  |  |  |  |  |  |  |  |  |
Estimated costs of remediation design |  |  | $ 165.0 |  |  |  |  |  |  |  |  |  |
Undiscounted environmental liability expected to be paid 2021 |  |  |  |  |  |  |  |  |  |  | $ 1.4 |  |
Undiscounted environmental liability expected to be paid 2022 |  |  |  |  |  |  |  |  |  |  | 2.9 |  |
Undiscounted environmental liability expected to be paid in 2023 |  |  |  |  |  |  |  |  |  |  | 2.9 |  |
Undiscounted environmental liability expected to be paid in 2024 |  |  |  |  |  |  |  |  |  |  | 3.1 |  |
Undiscounted environmental liability expected to be paid in 2025 |  |  |  |  |  |  |  |  |  |  | 2.8 |  |
Undiscounted environmental liability expected to be paid thereafter |  |  |  |  |  |  |  |  |  |  | 32.8 |  |
Leased Sites |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted environmental liability |  |  |  |  |  |  |  |  |  |  | 42.6 |  |
Undiscounted environmental liability |  |  |  |  |  |  |  |  |  |  | 45.9 |  |
Lower Passaic Cooperating Parties Group |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of companies | Company |  |  |  |  |  |  |  |  |  | 47 |  |  |
Property, Plant and Equipment, Other Types |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs, reserve |  |  |  |  |  |  |  |  |  |  | 174.2 | $ 213.8 |
Reserve for environmental remediation costs, current |  |  |  |  |  |  |  |  |  |  | 46.7 |  |
Reserve for environmental remediation costs, noncurrent |  |  |  |  |  |  |  |  |  |  | 127.5 |  |
Reserve for environmental loss contingencies, obligation after EPA funding |  |  |  |  |  |  |  |  |  |  | 158.3 |  |
Estimated environmental remediation expense |  |  |  |  |  |  |  |  |  |  | 24.7 |  |
Centredale Site |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs, reserve |  |  |  |  |  |  |  |  |  |  |  |  | $ 77.7
Environmental remediation costs deemed probable and reasonable estimable |  |  |  |  |  |  |  |  |  |  | $ 74.2 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs deemed probable and reasonable estimable | $ 420.0 |  |  |  |  |  |  |  |  |  |  |  |
Environmental liability discount rate |  |  |  |  |  |  |  |  |  |  | 0.10% |  |
Minimum | Property, Plant and Equipment, Other Types |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs deemed probable and reasonable estimable |  |  |  |  |  |  |  |  |  |  | $ 102.9 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs deemed probable and reasonable estimable | $ 468.0 |  |  |  |  |  |  |  |  |  |  |  |
Environmental liability discount rate |  |  |  |  |  |  |  |  |  |  | 1.80% |  |
Maximum | Property, Plant and Equipment, Other Types |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs deemed probable and reasonable estimable |  |  |  |  |  |  |  |  |  |  | $ 245.3 |  |
Cargo and Freight |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding obligations |  |  |  |  |  |  |  |  |  |  | $ 50.8 |  |

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