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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, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 8,311	$ 7,454	$ 26,707	$ 24,142
Weighted average shares	37,473	37,006	37,358	36,907
Effect of dilutive stock options and warrants	485	530	500	492
Denominator for diluted net income per share	37,958	37,536	37,858	37,399
Net income attributable to Neogen Corporation per share:
Basic	$ 0.22	$ 0.20	$ 0.71	$ 0.65
Diluted	$ 0.22	$ 0.20	$ 0.71	$ 0.65

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