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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. 25, 2021 | Sep. 26, 2020 | Sep. 25, 2021 | Sep. 26, 2020 | Dec. 26, 2020
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | $ 310,071 |  | $ 310,071 |  | $ 271,042
Accumulated Amortization | 186,003 |  | 186,003 |  | 170,847
Amortization expense for intangible assets | 6,137 | $ 4,518 | 15,551 | $ 13,621 |
Estimated amortization expense |  |  |  |  |
2021 | 21,392 |  | 21,392 |  |
2022 | 21,062 |  | 21,062 |  |
2023 | 19,261 |  | 19,261 |  |
2024 | 17,324 |  | 17,324 |  |
2025 | 15,868 |  | 15,868 |  |
Customer Relationships |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 239,493 |  | 239,493 |  | 237,232
Accumulated Amortization | 166,857 |  | $ 166,857 |  | $ 155,760
Weighted Average Life |  |  | 13 years |  | 13 years
Patents & Proprietary Technology |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 63,109 |  | $ 63,109 |  | $ 26,208
Accumulated Amortization | 12,318 |  | $ 12,318 |  | $ 8,301
Weighted Average Life |  |  | 8 years |  | 14 years
Other |  |  |  |  |
Components of amortized intangible assets |  |  |  |  |
Gross Carrying Amount | 7,469 |  | $ 7,469 |  | $ 7,602
Accumulated Amortization | $ 6,828 |  | $ 6,828 |  | $ 6,786
Weighted Average Life |  |  | 4 years |  | 4 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=123570139&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://www.xbrl.org/2003/role/disclosureRef -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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