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Nature of Operations and Summary of Significant Accounting Policies - Intangible Assets By Major Asset Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 30, 2017
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | $ 178,755 | $ 178,783
Currency Translation | (1,249) | (1,655)
Accumulated Amortization | (64,799) | (60,997)
Net | 112,707 | 116,131
Acquired Intangible Assets [Abstract] |  |
Gross | 195,355 | 195,383
Currency Translation | (921) | (1,350)
Net | 129,635 | 133,036
Trade Names [Member] |  |
Acquired Indefinite-Lived Intangible Assets [Line Items] |  |
Gross | 16,600 | 16,600
Currency Translation | 328 | 305
Net | 16,928 | 16,905
Customer Relationships [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 113,283 | 113,301
Currency Translation | (419) | (621)
Accumulated Amortization | (31,196) | (28,789)
Net | 81,668 | 83,891
Product Technology [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 46,501 | 46,501
Currency Translation | (584) | (737)
Accumulated Amortization | (20,797) | (19,841)
Net | 25,120 | 25,923
Trade Names [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 5,227 | 5,227
Currency Translation | (218) | (262)
Accumulated Amortization | (1,628) | (1,504)
Net | 3,381 | 3,461
Other Intangibles [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 13,744 | 13,754
Currency Translation | (28) | (35)
Accumulated Amortization | (11,178) | (10,863)
Net | $ 2,538 | $ 2,856

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