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Calculation of Net Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
May 31, 2013
May 31, 2012
May 31, 2011
Earnings Per Share [Line Items]                      
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 7,031 $ 6,652 $ 6,793 $ 6,714 $ 6,028 $ 5,244 $ 5,237 $ 6,004 $ 27,190 $ 22,513 $ 22,839
Denominator - Denominator for basic net income per share weighted average shares                 23,845 23,466 23,007
Effect of dilutive stock options and warrants                 482 553 784
Denominator for diluted net income per share                 24,327 24,019 23,791
Net income attributable to Neogen per share                      
Basic $ 0.29 $ 0.28 $ 0.29 $ 0.28 $ 0.26 $ 0.22 $ 0.22 $ 0.26 $ 1.14 $ 0.96 $ 0.99
Diluted $ 0.29 $ 0.27 $ 0.28 $ 0.28 $ 0.25 $ 0.22 $ 0.22 $ 0.25 $ 1.12 $ 0.94 $ 0.96