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Net Income Per Share - Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Earnings Per Share [Line Items]    
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 1,503 $ 5,209
Denominator for basic net income per share - Weighted average shares 216,309,084 107,837,295
Effect of dilutive stock options and RSUs 537,022 20,182
Denominator for diluted net income per share 216,846,106 107,857,477
Net income per share:    
Basic $ 0.01 $ 0.05
Diluted $ 0.01 $ 0.05