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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, 2015	Aug. 31, 2014
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 9,323	$ 8,883
Weighted average shares	37,213	36,776
Effect of dilutive stock options and warrants	542	514
Denominator for diluted net income per share	37,755	37,290
Net income attributable to Neogen Corporation per share:
Basic	$ 0.25	$ 0.24
Diluted	$ 0.25	$ 0.24

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