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Net Income per Share - Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Earnings Per Share [Line Items]    
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 5,209 $ 17,077
Denominator for basic net income per share - Weighted average shares 107,837 107,490
Effect of dilutive stock options and RSUs 20 619
Denominator for diluted net income per share 107,857 108,109
Net income attributable to Neogen per share:    
Basic $ 0.05 $ 0.16
Diluted $ 0.05 $ 0.16