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Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May. 31, 2015
May. 31, 2014
May. 31, 2013
Earnings Per Share [Line Items]                      
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 9,384 $ 7,454 $ 7,806 $ 8,883 $ 7,537 $ 6,575 $ 6,207 $ 7,839 $ 33,526 $ 28,158 $ 27,190
Denominator - Denominator for basic net income per share weighted average shares                 36,953 36,511 35,768
Effect of dilutive stock options                 491 756 723
Denominator for diluted net income per share                 37,444 37,267 36,491
Net Income Attributable to Neogen Per Share                      
Basic $ 0.26 $ 0.20 $ 0.21 $ 0.24 $ 0.20 $ 0.18 $ 0.17 $ 0.22 $ 0.91 $ 0.77 $ 0.76
Diluted $ 0.25 $ 0.20 $ 0.21 $ 0.24 $ 0.20 $ 0.18 $ 0.17 $ 0.21 $ 0.90 $ 0.76 $ 0.75