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Business Combinations - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Jun. 21, 2011
VeroMara
Jun. 30, 2011
GeneSeek, Inc.
Apr. 01, 2010
GeneSeek, Inc.
May 31, 2012
GeneSeek, Inc.
May 31, 2011
GeneSeek, Inc.
May 31, 2013
GeneSeek, Inc.
Jun. 30, 2011
GeneSeek, Inc.
First Year Contingent Payment
Jun. 30, 2011
GeneSeek, Inc.
Payment for Inventory Purchased and Other Liabilities
May 01, 2012
Merial Limited.
May 31, 2013
Merial Limited.
Oct. 01, 2012
Macleod Pharmaceuticals
Jan. 01, 2013
Scidera Genomics,LLC
Jul. 01, 2013
SyrVet, Inc.
Subsequent Event
May 31, 2013
Minimum
Apr. 01, 2010
Minimum
GeneSeek, Inc.
May 31, 2013
Maximum
Apr. 01, 2010
Maximum
GeneSeek, Inc.
Business Acquisition [Line Items]                                        
Cash consideration for purchase of business       $ 813,000   $ 14,050,000           $ 3,200,000   $ 9,918,000 $ 3,400,000 $ 10,012,000        
Contingent consideration potential payment       200,000   7,000,000               100,000   1,500,000        
Allocation of purchase price for accounts receivable           1,923,000               353,000            
Allocation of purchase price for inventory           1,512,000               1,238,000            
Allocation of purchase price for fixed assets           847,000           340,000   300,000 246,000          
Allocation of purchase price for current liabilities           905,000                            
Allocation of purchase price for deferred tax liabilities           2,530,000               2,054,000            
Allocation of purchase price for contingent consideration potential payment           3,583,000   4,370,000 1,500,000     600,000   100,000            
Purchase price allocation for intangible assets           6,802,000           2,036,000   5,542,000 1,570,000          
Other intangible assets estimated lives (years)                                 5 years 5 years 20 years 20 years
Contingent consideration payment term           3 years                            
Change in purchase consideration (14,000) 154,000 (787,000)         787,000                        
Contingent consideration payment         1,856,000   1,263,000     1,537,000 319,000                  
Allocation of purchase price for contingent consideration potential payment, adjustment             (154,000)                          
Estimated revenues from acquisitions       800,000                                
Purchase price allocation for current assets                       110,000   82,000 35,000          
Cash paid for data                       500,000                
Reversed the remaining consideration accrual to other income                         $ 100,000              
Sales from International Markets                               30.00%