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Summary of Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2019	May 31, 2018	May 31, 2017
Total Revenue	$ 109,762	$ 97,700	$ 107,098	$ 99,626	$ 108,120	$ 94,903	$ 100,698	$ 94,209	$ 414,186	$ 397,930	$ 358,277
Gross Margin	50,530	44,628	50,033	46,729	48,498	44,601	48,249	44,924	191,920	186,272	168,924
Net Income	$ 15,815	$ 13,073	$ 16,051	$ 15,237	17,545	16,581	17,153	11,936	60,176	63,215	43,973
Net income attributable to Neogen					$ 17,545	$ 16,586	$ 17,100	$ 11,914	$ 60,176	$ 63,145	$ 43,793
Basic net income per share	$ 0.31	$ 0.25	$ 0.31	$ 0.29	$ 0.34	$ 0.32	$ 0.33	$ 0.23	$ 1.16	$ 1.23	$ 0.87
Diluted net income per share	$ 0.30	$ 0.25	$ 0.31	$ 0.29	$ 0.33	$ 0.32	$ 0.33	$ 0.23	$ 1.15	$ 1.21	$ 0.86

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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