v3.26.3
Net (Loss) Income Per Share - Calculation of Net (Loss) Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Earnings Per Share [Line Items]    
Numerator for basic and diluted net (loss) income per share: Net (loss) income attributable to Neogen $ (11.9) $ 36.3
Denominator for basic net (loss) income per share: Weighted average shares 218.1 217.2
Effective of dilutive stock awards 0.0 0.1
Denominator for diluted net (loss) income per share 218.1 217.3
Net (loss) income per share:    
Basic $ (0.05) $ 0.17
Diluted $ (0.05) $ 0.17