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SEGMENT AND SIGNIFICANT CUSTOMER INFORMATION (Details)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Animal Health International, Inc [Member]
      
Total product sales 35.00% [1] 38.00% [1] 36.00% [1]
MWI Veterinary Supply Company [Member]
      
Total product sales 14.00% [2] 14.00% [2] 13.00% [2]
[1] Assumes that the June 2011 acquisition of Animal Health International by Lextron had occurred as of the beginning of the periods being reported.
[2] Assumes that the March 2011 acquisition of Nelson Laboratories and the October 2011 acquisition of Micro Beef Technologies by MWI had occurred as of the beginning of the periods being reported.