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Calculation of Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 6,575	$ 6,652	$ 20,621	$ 20,158
Weighted average shares	36,613	35,841	36,471	35,699
Effect of dilutive stock options and warrants	620	762	678	756
Denominator for diluted net income per share	37,233	36,603	37,149	36,455
Net income attributable to Neogen Corporation per share:
Basic	$ 0.18	$ 0.19	$ 0.57	$ 0.56
Diluted	$ 0.18	$ 0.18	$ 0.56	$ 0.55

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