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Goodwill by Business Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017
Goodwill [Line Items] |  |  |
Beginning Balance |  | $ 104,759 | $ 88,506
Goodwill acquired |  | 757 | 19,051
Goodwill adjustments and/or currency | [1] | (5,958) | (2,798)
Ending Balance |  | 99,558 | 104,759
Food Safety |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance |  | 45,920 | 26,889
Goodwill acquired |  |  | 19,051
Goodwill adjustments and/or currency | [1] | (5,919) | (20)
Ending Balance |  | 40,001 | 45,920
Animal Safety |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance |  | 58,839 | 61,617
Goodwill acquired |  | 757 |
Goodwill adjustments and/or currency | [1] | (39) | (2,778)
Ending Balance |  | $ 59,557 | $ 58,839
[1] | Includes final purchase price allocation adjustment.

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