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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 patent | Dec. 31, 2016 USD ($) | Dec. 26, 2015 USD ($) | Dec. 27, 2014 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Rent expense from operating leases |  | $ 21.8 | $ 23.4 | $ 14.2
Maximum insurance deductibles |  | 5.0 |  |
Litigation [Line Items] |  |  |  |
Unconditional purchase obligations |  | 86.2 |  |
Government Billing |  |  |  |
Litigation [Line Items] |  |  |  |
Liability for excess amounts billed on contracts |  | 1.8 | $ 1.5 |
Additional charge for excess amounts billed on contracts |  | $ 0.3 |  |
Pending Litigation | Idexx |  |  |  |
Litigation [Line Items] |  |  |  |
Patents allegedly infringed, number | patent | 3 |  |  |

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