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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 16,051	$ 17,100	$ 31,288	$ 29,014
Denominator for basic net income per share - Weighted average shares	52,019	51,264	51,820	51,109
Effect of dilutive stock options	572	697	721	669
Denominator for diluted net income per share	52,591	51,961	52,541	51,778
Net income attributable to Neogen per share:
Basic	$ 0.31	$ 0.33	$ 0.60	$ 0.57
Diluted	$ 0.31	$ 0.33	$ 0.60	$ 0.56

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