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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 13,377	$ 12,200	$ 45,122	$ 43,128
Denominator for basic net income per share - Weighted average shares	53,413	52,795	53,132	52,463
Effect of dilutive stock options and RSUs	282	253	252	320
Denominator for diluted net income per share	53,695	53,048	53,384	52,783
Net income attributable to Neogen per share:
Basic	$ 0.25	$ 0.23	$ 0.85	$ 0.82
Diluted	$ 0.25	$ 0.23	$ 0.85	$ 0.82

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