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Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Earnings Per Share [Line Items]        
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 10,828 $ 15,885 $ 27,905 $ 31,745
Denominator for basic net income per share - Weighted average shares 107,641 106,258 107,565 106,044
Effect of dilutive stock options and RSUs 481 550 534 556
Denominator for diluted net income per share 108,122 106,808 108,099 106,600
Net income attributable to Neogen per share:        
Basic $ 0.10 $ 0.15 $ 0.26 $ 0.30
Diluted $ 0.10 $ 0.15 $ 0.26 $ 0.30