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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, 2021	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2021	May 31, 2020	May 31, 2019
Earnings Per Share [Line Items]
Numerator for basic and diluted net income per share — Net Income attributable to Neogen									$ 60,882	$ 59,475	$ 60,176
Denominator for basic net income per share — Weighted average shares									106,499	105,100	103,776
Effect of dilutive stock options									621	620	1,074
Denominator for diluted net income per share									107,120	105,720	104,850
Net income attributable to Neogen per share:
Basic	$ 0.15	$ 0.13	$ 0.15	$ 0.15	$ 0.15	$ 0.12	$ 0.15	$ 0.14	$ 0.57	$ 0.57	$ 0.58
Diluted	$ 0.15	$ 0.12	$ 0.15	$ 0.15	$ 0.15	$ 0.11	$ 0.15	$ 0.14	$ 0.57	$ 0.56	$ 0.57

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