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Summary of Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2017	May 31, 2016	May 31, 2015
Quarterly Financial Information [Line Items]
Total Revenue	$ 98,847	$ 88,385	$ 90,717	$ 83,645	$ 90,080	$ 76,725	$ 79,610	$ 74,860	$ 361,594	$ 321,275	$ 283,074
Gross Margin	47,018	40,880	43,591	40,479	41,852	35,196	38,224	37,792	171,968	153,064	139,685
Net income	$ 12,491	$ 10,377	$ 11,171	$ 9,934	$ 9,818	$ 8,289	$ 9,142	$ 9,289	$ 43,793	$ 36,564	$ 33,526
Basic net income per share	$ 0.34	$ 0.27	$ 0.29	$ 0.26	$ 0.27	$ 0.22	$ 0.24	$ 0.25	$ 1.16	$ 0.98	$ 0.91
Diluted net income per share	$ 0.32	$ 0.27	$ 0.29	$ 0.26	$ 0.26	$ 0.22	$ 0.24	$ 0.25	$ 1.14	$ 0.97	$ 0.90
Neogen
Quarterly Financial Information [Line Items]
Net income	$ 12,474	$ 10,287	$ 11,151	$ 9,881	$ 9,857	$ 8,311	$ 9,073	$ 9,323

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