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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, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 16,276	$ 16,051	$ 30,928	$ 31,288
Denominator for basic net income per share - Weighted average shares	52,557	52,019	52,355	51,820
Effect of dilutive stock options	319	572	357	721
Denominator for diluted net income per share	52,876	52,591	52,712	52,541
Net income attributable to Neogen per share:
Basic	$ 0.31	$ 0.31	$ 0.59	$ 0.60
Diluted	$ 0.31	$ 0.31	$ 0.59	$ 0.60

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