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Net Loss Per Share - Calculation of Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Earnings Per Share [Line Items]        
Numerator for basic and diluted net loss per share: - Net loss attributable to Neogen $ (10,957) $ (2,022) $ (479,848) $ (4,006)
Denominator for basic net loss per share - Weighted average shares 217,031,907 216,597,777 216,845,782 216,438,643
Effect of dilutive stock options and RSUs 0 0 0 0
Denominator for diluted net loss per share 217,031,907 216,597,777 216,845,782 216,438,643
Net loss per share:        
Basic $ (0.05) $ (0.01) $ (2.21) $ (0.02)
Diluted $ (0.05) $ (0.01) $ (2.21) $ (0.02)