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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | $ 424,628 | [1] | $ 414,038
Accumulated Amortization | (344,594) |  | (337,155)
Foreign Currency Translation Adjustment | 4,379 |  | 2,205
Net Carrying Amount | 84,413 |  | 79,088
Developed technology |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 276,417 | [1] | 270,877
Accumulated Amortization | (231,266) |  | (226,190)
Foreign Currency Translation Adjustment | 3,214 |  | 1,618
Net Carrying Amount | 48,365 |  | 46,305
Customer Relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 96,771 | [1] | 92,741
Accumulated Amortization | (84,940) |  | (83,585)
Foreign Currency Translation Adjustment | 340 |  | 171
Net Carrying Amount | 12,171 |  | 9,327
Trademarks and tradenames |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 51,120 | [1] | 50,100
Accumulated Amortization | (28,108) |  | (27,120)
Foreign Currency Translation Adjustment | 825 |  | 416
Net Carrying Amount | 23,837 |  | 23,396
Non-compete Agreements |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 320 | [1] | 320
Accumulated Amortization | (280) |  | (260)
Net Carrying Amount | $ 40 |  | $ 60
[1] | Gross carrying amount includes $10.9 million of Energid acquired intangible assets.

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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