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Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Earnings Per Share [Line Items]        
Numerator for basic and diluted net income per share - Net income attributable to Neogen $ 10,287 $ 8,311 $ 31,320 $ 26,707
Denominator for basic net income per share - Weighted average shares 38,059 37,473 37,829 37,358
Effect of dilutive stock options 475 485 542 500
Denominator for diluted net income per share 38,534 37,958 38,371 37,858
Net income attributable to Neogen per share:        
Basic $ 0.27 $ 0.22 $ 0.83 $ 0.71
Diluted $ 0.27 $ 0.22 $ 0.82 $ 0.71