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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 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Earnings Per Share [Line Items]        
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 5,443 $ 13,377 $ 33,348 $ 45,122
Denominator for basic net income per share - Weighted average shares 107,818 106,826 107,648 106,264
Effect of dilutive stock options and RSUs 315 564 482 504
Denominator for diluted net income per share 108,133 107,390 108,130 106,768
Net income attributable to Neogen per share:        
Basic $ 0.05 $ 0.13 $ 0.31 $ 0.42
Diluted $ 0.05 $ 0.12 $ 0.31 $ 0.42