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Summary of Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2017 | May 31, 2016 | May 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenue | $ 98,847 | $ 88,385 | $ 90,717 | $ 83,645 | $ 90,080 | $ 76,725 | $ 79,610 | $ 74,860 | $ 361,594 | $ 321,275 | $ 283,074
Gross Margin | 47,018 | 40,880 | 43,591 | 40,479 | 41,852 | 35,196 | 38,224 | 37,792 | 171,968 | 153,064 | 139,685
Net income | $ 12,491 | $ 10,377 | $ 11,171 | $ 9,934 | $ 9,818 | $ 8,289 | $ 9,142 | $ 9,289 | $ 43,793 | $ 36,564 | $ 33,526
Basic net income per share | $ 0.34 | $ 0.27 | $ 0.29 | $ 0.26 | $ 0.27 | $ 0.22 | $ 0.24 | $ 0.25 | $ 1.16 | $ 0.98 | $ 0.91
Diluted net income per share | $ 0.32 | $ 0.27 | $ 0.29 | $ 0.26 | $ 0.26 | $ 0.22 | $ 0.24 | $ 0.25 | $ 1.14 | $ 0.97 | $ 0.90
Neogen |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 12,474 | $ 10,287 | $ 11,151 | $ 9,881 | $ 9,857 | $ 8,311 | $ 9,073 | $ 9,323 |  |  |

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