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Business Acquisitions Celsis Purchase Price Acquisitions (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Nov. 18, 2015 | Jul. 24, 2015 | May. 05, 2015 | Dec. 27, 2014 | Dec. 28, 2013
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 438,829 |  |  |  | $ 321,077 | $ 230,701
Celsis Group Limited |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Trade receivables |  |  | $ 5,288 |  |  |
Inventories |  |  | 10,103 |  |  |
Other current assets (excluding cash) |  |  | 13,432 |  |  |
Property, plant and equipment |  |  | 4,639 |  |  |
Definite-lived intangible assets |  |  | 118,140 |  |  |
Goodwill |  |  | 105,380 |  |  |
Other long-term assets |  |  | 614 |  |  |
Short-term debt |  |  | (9,766) |  |  |
Current liabilities |  |  | (7,448) |  |  |
Long-term liabilities |  |  | (28,146) |  |  |
Total purchase price allocation |  |  | 212,236 |  |  |
Acquired receivables, contractual amount |  |  | $ 5,410 |  |  |
Sunrise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Trade receivables |  |  |  | $ 981 |  |
Inventories |  |  |  | 1,518 |  |
Other current assets (excluding cash) |  |  |  | 973 |  |
Property, plant and equipment |  |  |  | 13,698 |  |
Definite-lived intangible assets |  |  |  | 3,400 |  |
Acquired receivables, contractual amount |  |  |  | $ 995 |  |
Oncotest |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Trade receivables |  | $ 3,520 |  |  |  |
Inventories |  | 129 |  |  |  |
Other current assets (excluding cash) |  | 706 |  |  |  |
Property, plant and equipment |  | 2,528 |  |  |  |
Definite-lived intangible assets |  | 13,330 |  |  |  |
Goodwill |  | 22,894 |  |  |  |
Other long-term assets |  | 250 |  |  |  |
Current liabilities |  | (3,456) |  |  |  |
Long-term liabilities |  | (4,470) |  |  |  |
Total purchase price allocation |  | 35,431 |  |  |  |
Acquired receivables, contractual amount |  | $ 3,546 |  |  |  |

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