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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