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Calculation of Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Earnings Per Share [Line Items]
Net Income attributable to Neogen shareholders	$ 6,207	$ 6,793	$ 14,045	$ 13,507
Weighted average shares	36,458	35,742	36,302	35,628
Effect of dilutive stock options and warrants	916	659	939	719
Denominator for diluted net income per share	37,374	36,401	37,241	36,347
Net income attributable to Neogen Corporation per share:
Basic	$ 0.17	$ 0.19	$ 0.39	$ 0.38
Diluted	$ 0.17	$ 0.19	$ 0.38	$ 0.37

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