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Calculation of Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2014	May 31, 2013	May 31, 2012
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 7,537	$ 6,575	$ 6,207	$ 7,839	$ 7,031	$ 6,652	$ 6,793	$ 6,714	$ 28,158	$ 27,190	$ 22,513
Denominator - Denominator for basic net income per share weighted average shares									36,511	35,768	35,199
Effect of dilutive stock options									756	723	830
Denominator for diluted net income per share									37,267	36,491	36,029
Net Income Attributable to Neogen Per Share
Basic	$ 0.20	$ 0.18	$ 0.17	$ 0.22	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.77	$ 0.76	$ 0.64
Diluted	$ 0.20	$ 0.18	$ 0.17	$ 0.21	$ 0.19	$ 0.19	$ 0.18	$ 0.19	$ 0.76	$ 0.75	$ 0.62

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