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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 15,860	$ 14,652
Denominator for basic net income per share - Weighted average shares	52,992	52,292
Effect of dilutive stock options	293	392
Denominator for diluted net income per share	53,285	52,684
Net income attributable to Neogen per share:
Basic	$ 0.30	$ 0.28
Diluted	$ 0.30	$ 0.28

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