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SEGMENT AND SIGNIFICANT CUSTOMER INFORMATION (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Animal Health International, Inc [Member]
        
Total product sales 35.00% [1] 38.00% [1] 35.00% [1] 40.00% [1]
MWI Veterinary Supply Company [Member]
        
Total product sales 17.00% [2] 15.00% [2] 14.00% [2] 14.00% [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.