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Net Loss Per Share - Calculation of Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Nov. 30, 2024
Nov. 30, 2023
Earnings Per Share [Line Items]        
Numerator for basic and diluted net loss per share: - Net loss attributable to Neogen $ (456,282) $ (3,487) $ (468,891) $ (1,984)
Denominator for basic net loss per share - Weighted average shares 216,813,788 216,410,493 216,754,244 216,359,511
Effect of dilutive stock options and RSUs 0 0 0 0
Denominator for diluted net loss per share 216,813,788 216,410,493 216,754,244 216,359,511
Net loss per share:        
Basic $ (2.10) $ (0.02) $ (2.16) $ (0.01)
Diluted $ (2.10) $ (0.02) $ (2.16) $ (0.01)