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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2016	May 31, 2015	May 31, 2014
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 9,818	$ 8,289	$ 9,142	$ 9,289	$ 9,432	$ 7,409	$ 7,826	$ 8,909	$ 36,564	$ 33,526	$ 28,158
Denominator for basic net income per share - Weighted average shares									37,402	36,953	36,511
Effect of dilutive stock options									473	491	756
Denominator for diluted net income per share									37,875	37,444	37,267
Net Income Attributable to Neogen Per Share
Basic	$ 0.27	$ 0.22	$ 0.24	$ 0.25	$ 0.26	$ 0.20	$ 0.21	$ 0.24	$ 0.98	$ 0.91	$ 0.77
Diluted	$ 0.26	$ 0.22	$ 0.24	$ 0.25	$ 0.25	$ 0.20	$ 0.21	$ 0.24	$ 0.97	$ 0.90	$ 0.76

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Earnings Per Share [Line Items]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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