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Summary of Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2016	May 31, 2015	May 31, 2014
Quarterly Financial Information [Line Items]
Total revenues	$ 90,080	$ 76,725	$ 79,610	$ 74,860	$ 78,611	$ 68,409	$ 68,455	$ 67,599	$ 321,275	$ 283,074	$ 247,405
Gross margin	41,852	35,196	38,224	37,792	37,698	33,703	34,208	34,076	153,064	139,685	122,598
Net income	$ 9,818	$ 8,289	$ 9,142	$ 9,289	$ 9,432	$ 7,409	$ 7,826	$ 8,909	$ 36,564	$ 33,526	$ 28,158
Basic net income per share	$ 0.27	$ 0.22	$ 0.24	$ 0.25	$ 0.26	$ 0.20	$ 0.21	$ 0.24	$ 0.98	$ 0.91	$ 0.77
Diluted net income per share	$ 0.26	$ 0.22	$ 0.24	$ 0.25	$ 0.25	$ 0.20	$ 0.21	$ 0.24	$ 0.97	$ 0.90	$ 0.76
Neogen
Quarterly Financial Information [Line Items]
Net income	$ 9,857	$ 8,311	$ 9,073	$ 9,323	$ 9,384	$ 7,454	$ 7,806	$ 8,883

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