v2.4.0.6
Calculation of Net Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Earnings Per Share [Line Items]    
Net Income attributable to Neogen shareholders $ 6,714 $ 6,004
Weighted average shares 23,678 23,326
Effect of dilutive stock options and warrants 520 735
Denominator for diluted net income per share 24,198 24,061
Net income attributable to Neogen Corporation per share:    
Basic $ 0.28 $ 0.26
Diluted $ 0.28 $ 0.25