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Net Income (Loss) Per Share - Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 28, 2023
Nov. 30, 2022
Feb. 28, 2022
Nov. 30, 2022
Feb. 28, 2023
Feb. 28, 2022
Earnings Per Share [Line Items]            
Numerator for basic and diluted net income (loss) per share - Net income (loss) attributable to Neogen $ 8,190   $ 5,443   $ (28,442) $ 33,348
Denominator for basic net income (loss) per share - Weighted average shares 216,218   107,818   179,666 107,648
Effect of dilutive stock options and RSUs 181   315     482
Denominator for diluted net income (loss) per share 216,399 216,399 108,133 179,666 179,666 108,130
Net income (loss) per share:            
Basic $ 0.04   $ 0.05   $ (0.16) $ 0.31
Diluted $ 0.04   $ 0.05   $ (0.16) $ 0.31