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Summary of Quarterly Data (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information [Line Items]                      
Total revenues $ 78,611 $ 68,409 $ 68,455 $ 67,599 $ 67,262 $ 61,996 $ 59,599 $ 58,548 $ 283,074 $ 247,405 $ 207,528
Gross margin 37,698 33,703 34,208 34,076 32,038 30,705 29,491 30,364 139,685 122,598 109,494
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
Basic net income per share $ 0.26 $ 0.20 $ 0.21 $ 0.24 $ 0.20 $ 0.18 $ 0.17 $ 0.22 $ 0.91 $ 0.77 $ 0.76
Diluted net income per share $ 0.25 $ 0.20 $ 0.21 $ 0.24 $ 0.20 $ 0.18 $ 0.17 $ 0.21 $ 0.90 $ 0.76 $ 0.75