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Calculation of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share - Net income attributable to Neogen	$ 15,885	$ 16,276	$ 31,745	$ 30,928
Denominator for basic net income per share - Weighted average shares	53,129	52,557	53,022	52,355
Effect of dilutive stock options and RSUs	275	319	278	357
Denominator for diluted net income per share	53,404	52,876	53,300	52,712
Net income attributable to Neogen per share:
Basic	$ 0.30	$ 0.31	$ 0.60	$ 0.59
Diluted	$ 0.30	$ 0.31	$ 0.60	$ 0.59

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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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