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GOODWILL AND INTANGIBLE ASSETS - Amortized Intangible Assets - (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | $ 250,329 |  | $ 250,329 |  | $ 216,035
Accumulated Amortization | 141,390 |  | 141,390 |  | 142,289
Amortization expense for intangible assets | 3,721 | $ 4,025 | 11,176 | $ 11,792 |
Estimated amortization expense |  |  |  |  |
2018 | 15,264 |  | 15,264 |  |
2019 | 16,081 |  | 16,081 |  |
2020 | 14,969 |  | 14,969 |  |
2021 | 12,885 |  | 12,885 |  |
2022 | 10,740 |  | 10,740 |  |
Customer Relationships |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 218,492 |  | 218,492 |  | 200,810
Accumulated Amortization | 130,082 |  | $ 130,082 |  | $ 131,062
Weighted Average Life |  |  | 13 years |  | 13 years
Patents & Proprietary Technology |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 23,846 |  | $ 23,846 |  | $ 6,693
Accumulated Amortization | 4,440 |  | $ 4,440 |  | $ 3,999
Weighted Average Life |  |  | 14 years |  | 11 years
Other |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 7,991 |  | $ 7,991 |  | $ 8,532
Accumulated Amortization | $ 6,868 |  | $ 6,868 |  | $ 7,228
Weighted Average Life |  |  | 5 years |  | 5 years

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: 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=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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