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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, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 13,073	$ 16,586	$ 44,361	$ 45,600
Denominator for basic net income per share - Weighted average shares	52,071	51,537	51,849	51,253
Effect of dilutive stock options	401	700	599	761
Denominator for diluted net income per share	52,472	52,237	52,448	52,014
Net income attributable to Neogen per share:
Basic	$ 0.25	$ 0.32	$ 0.86	$ 0.89
Diluted	$ 0.25	$ 0.32	$ 0.85	$ 0.88

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