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Summary of Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2018	May 31, 2017	May 31, 2016
Quarterly Financial Information [Line Items]
Total Revenue	$ 109,287	$ 95,892	$ 101,817	$ 95,256	$ 98,847	$ 88,385	$ 90,717	$ 83,645	$ 402,252	$ 361,594	$ 321,275
Gross Margin	49,589	45,521	49,271	45,871	47,018	40,880	43,591	40,479	190,252	171,968	153,064
Net income	17,545	16,581	17,153	11,936	12,491	10,377	11,171	9,934	63,215	43,973	36,538
Net income attributable to Neogen	$ 17,545	$ 16,586	$ 17,100	$ 11,914	$ 12,474	$ 10,287	$ 11,151	$ 9,881	$ 63,145	$ 43,793	$ 36,564
Basic net income per share	$ 0.34	$ 0.32	$ 0.33	$ 0.23	$ 0.25	$ 0.20	$ 0.22	$ 0.20	$ 1.23	$ 0.87	$ 0.73
Diluted net income per share	$ 0.33	$ 0.32	$ 0.33	$ 0.23	$ 0.24	$ 0.20	$ 0.22	$ 0.20	$ 1.21	$ 0.86	$ 0.72

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