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GOODWILL AND INTANGIBLE ASSETS - Carrying Values of Trade Names - (Details) | 3 Months Ended |
--- | --- | ---
Jun. 27, 2020 USD ($) numberOfTradeNames | Sep. 28, 2019 USD ($) | Dec. 28, 2019 USD ($)
Non-amortized intangible assets |  |  |
Number of trade names impaired | numberOfTradeNames | 2 |  |
Newmark |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | $ 11,111,000 |  | $ 11,111,000
Webforge |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 7,250,000 |  | 9,143,000
Convert Italia S.p.A |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 8,412,000 |  | 8,378,000
Valmont SM |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 8,010,000 |  | 7,966,000
Ingal EPS/Ingal Civil Products |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 7,029,000 |  | 7,454,000
Walpar |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 3,500,000 |  | 3,500,000
Shakespeare |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 4,000,000 |  | 4,000,000
Other |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 14,570,000 |  | 17,555,000
Trade Names |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 63,882,000 |  | $ 69,107,000
Impairment indefinite-lived intangible assets | $ 3,900,000 | $ 0 |

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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