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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PP&E (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Long-lived assets |  |  |
Depreciation expense | $ 63,890 | $ 64,177 | $ 67,499
Buildings and improvements | Minimum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 15 years |  |
Buildings and improvements | Maximum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 40 years |  |
Machinery and equipment | Minimum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 3 years |  |
Machinery and equipment | Maximum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 12 years |  |
Transportation equipment | Minimum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 3 years |  |
Transportation equipment | Maximum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 24 years |  |
Office furniture and equipment | Minimum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 3 years |  |
Office furniture and equipment | Maximum |  |  |
Long-lived assets |  |  |
Estimated useful lives | 7 years |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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