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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, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2017	May 31, 2016	May 31, 2015
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net Income attributable to Neogen	$ 12,491	$ 10,377	$ 11,171	$ 9,934	$ 9,818	$ 8,289	$ 9,142	$ 9,289	$ 43,793	$ 36,564	$ 33,526
Denominator for basic net income per share - Weighted average shares									37,908	37,402	36,953
Effect of dilutive stock options									466	473	491
Denominator for diluted net income per share									38,374	37,875	37,444
Net Income Attributable to Neogen per Share
Basic	$ 0.34	$ 0.27	$ 0.29	$ 0.26	$ 0.27	$ 0.22	$ 0.24	$ 0.25	$ 1.16	$ 0.98	$ 0.91
Diluted	$ 0.32	$ 0.27	$ 0.29	$ 0.26	$ 0.26	$ 0.22	$ 0.24	$ 0.25	$ 1.14	$ 0.97	$ 0.90

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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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