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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, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 9,073	$ 7,806	$ 18,396	$ 16,689
Weighted average shares	37,390	36,941	37,301	36,858
Effect of dilutive stock options and warrants	478	438	509	473
Denominator for diluted net income per share	37,868	37,379	37,810	37,331
Net income attributable to Neogen Corporation per share:
Basic	$ 0.24	$ 0.21	$ 0.49	$ 0.45
Diluted	$ 0.24	$ 0.21	$ 0.49	$ 0.45

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