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GOODWILL AND INTANGIBLE ASSETS - Amortized Intangible Assets - (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Dec. 30, 2017
Components of amortized intangible assets |  |  |  |
Gross Carrying Amount | $ 204,077 |  | $ 204,077 | $ 216,035
Accumulated Amortization | 138,006 |  | 138,006 | 142,289
Amortization expense for intangible assets | 3,572 | $ 3,903 | 7,767 |
Estimated amortization expense |  |  |  |
2015 | 14,187 |  | 14,187 |
2016 | 12,903 |  | 12,903 |
2017 | 11,804 |  | 11,804 |
2018 | 9,748 |  | 9,748 |
2019 | 7,573 |  | 7,573 |
Customer Relationships |  |  |  |
Components of amortized intangible assets |  |  |  |
Gross Carrying Amount | 188,767 |  | 188,767 | 200,810
Accumulated Amortization | 126,904 |  | $ 126,904 | $ 131,062
Weighted Average Life |  |  | 13 years | 13 years
Proprietary Software & Database |  |  |  |
Components of amortized intangible assets |  |  |  |
Gross Carrying Amount | 3,589 |  | $ 3,589 | $ 3,671
Accumulated Amortization | 3,075 |  | $ 3,075 | $ 3,107
Weighted Average Life |  |  | 8 years | 8 years
Patents & Proprietary Technology |  |  |  |
Components of amortized intangible assets |  |  |  |
Gross Carrying Amount | 7,225 |  | $ 7,225 | $ 6,693
Accumulated Amortization | 4,238 |  | $ 4,238 | $ 3,999
Weighted Average Life |  |  | 11 years | 11 years
Other |  |  |  |
Components of amortized intangible assets |  |  |  |
Gross Carrying Amount | 4,496 |  | $ 4,496 | $ 4,861
Accumulated Amortization | $ 3,789 |  | $ 3,789 | $ 4,121
Weighted Average Life |  |  | 3 years | 3 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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