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RESTRUCTURING AND ASSET IMPAIRMENTS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | $ 3,680 | $ 2,969 | $ 2,666 | $ 2,782
Consolidation of Safety Assessment Facilities in Ireland |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments | 9,400 |  |  |
Consolidation of Research Model Operations in U.S., Japan and Europe |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset impairments |  | 1,800 | 2,200 |
Accelerated depreciation |  |  | 4,300 |
Gain on disposition of European facility |  |  | $ 1,000 |
Accrued Compensation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | 3,600 | 2,600 |  |
Other long-term liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | $ 100 | $ 300 |  |

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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