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Calculation of Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 7,839	$ 6,714
Weighted average shares	24,106	23,678
Effect of dilutive stock options and warrants	572	520
Denominator for diluted net income per share	24,678	24,198
Net income attributable to Neogen Corporation per share:
Basic	$ 0.33	$ 0.28
Diluted	$ 0.32	$ 0.28

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