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Goodwill by Business Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2017
May 31, 2016
Goodwill [Line Items]    
Beginning Balance $ 88,506 $ 70,119
Goodwill acquired and/or adjusted 16,253 [1] 18,387
Ending Balance 104,759 88,506
Food Safety    
Goodwill [Line Items]    
Beginning Balance 26,889 18,806
Goodwill acquired and/or adjusted 19,031 [1] 8,083
Ending Balance 45,920 26,889
Animal Safety    
Goodwill [Line Items]    
Beginning Balance 61,617 51,313
Goodwill acquired and/or adjusted (2,778) [1] 10,304
Ending Balance $ 58,839 $ 61,617
[1] Represents final purchase price allocation adjustment