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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 16,586	$ 10,287	$ 45,600	$ 31,320
Denominator for basic net income per share - Weighted average shares	51,537	50,746	51,253	50,438
Effect of dilutive stock options	700	633	761	723
Denominator for diluted net income per share	52,237	51,379	52,014	51,161
Net income attributable to Neogen per share:
Basic	$ 0.32	$ 0.20	$ 0.89	$ 0.62
Diluted	$ 0.32	$ 0.20	$ 0.88	$ 0.61

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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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