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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 11,914	$ 9,881
Denominator for basic net income per share - Weighted average shares	38,211	37,615
Effect of dilutive stock options	465	550
Denominator for diluted net income per share	38,676	38,165
Net income attributable to Neogen per share:
Basic	$ 0.31	$ 0.26
Diluted	$ 0.31	$ 0.26

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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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