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Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Earnings Per Share [Line Items]      
Numerator for basic and diluted net income per share — Net Income attributable to Neogen $ 48,307 $ 60,882 $ 59,475
Denominator for basic net income per share — Weighted average shares 107,684 106,499 105,100
Effect of dilutive stock options 336 621 620
Denominator for diluted net income per share 108,020 107,120 105,720
Net income attributable to Neogen per share:      
Basic $ 0.45 $ 0.57 $ 0.57
Diluted $ 0.45 $ 0.57 $ 0.56