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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, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2018	May 31, 2017	May 31, 2016
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net Income attributable to Neogen	$ 17,545	$ 16,586	$ 17,100	$ 11,914	$ 12,474	$ 10,287	$ 11,151	$ 9,881	$ 63,145	$ 43,793	$ 36,564
Denominator for basic net income per share - Weighted average shares									51,358	50,544	49,869
Effect of dilutive stock options									791	621	631
Denominator for diluted net income per share									52,149	51,165	50,500
Net Income Attributable to Neogen per Share
Basic	$ 0.34	$ 0.32	$ 0.33	$ 0.23	$ 0.25	$ 0.20	$ 0.22	$ 0.20	$ 1.23	$ 0.87	$ 0.73
Diluted	$ 0.33	$ 0.32	$ 0.33	$ 0.23	$ 0.24	$ 0.20	$ 0.22	$ 0.20	$ 1.21	$ 0.86	$ 0.72

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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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