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Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Earnings Per Share [Line Items]        
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 11,151 $ 9,073 $ 21,032 $ 18,396
Denominator for basic net income per share - Weighted average shares 37,816 37,390 37,715 37,301
Effect of dilutive stock options 446 478 468 509
Denominator for diluted net income per share 38,262 37,868 38,183 37,810
Net income attributable to Neogen per share:        
Basic $ 0.29 $ 0.24 $ 0.56 $ 0.49
Diluted $ 0.29 $ 0.24 $ 0.55 $ 0.49