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GOODWILL AND INTANGIBLE ASSETS - Amortized Intangible Assets - (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 30, 2019 | Mar. 31, 2018 | Dec. 29, 2018
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 272,100 |  | $ 251,141
Accumulated Amortization | 149,080 |  | 143,908
Amortization expense for intangible assets | 4,390 | $ 3,883 |
Estimated amortization expense |  |  |
2019 | 18,238 |  |
2020 | 17,404 |  |
2021 | 15,378 |  |
2022 | 13,228 |  |
2023 | 11,483 |  |
Customer Relationships |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | 240,786 |  | 219,508
Accumulated Amortization | $ 136,961 |  | $ 132,180
Weighted Average Life | 13 years |  | 13 years
Patents & Proprietary Technology |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 23,396 |  | $ 23,662
Accumulated Amortization | $ 5,232 |  | $ 4,837
Weighted Average Life | 14 years |  | 14 years
Other |  |  |
Components of amortized intangible assets |  |  |
Gross Carrying Amount | $ 7,918 |  | $ 7,971
Accumulated Amortization | $ 6,887 |  | $ 6,891
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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