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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. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 12,200	$ 13,073	$ 43,128	$ 44,361
Denominator for basic net income per share - Weighted average shares	52,795	52,071	52,463	51,849
Effect of dilutive stock options	253	401	320	599
Denominator for diluted net income per share	53,048	52,472	52,783	52,448
Net income attributable to Neogen per share:
Basic	$ 0.23	$ 0.25	$ 0.82	$ 0.86
Diluted	$ 0.23	$ 0.25	$ 0.82	$ 0.85

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