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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Revenues      
Product revenues $ 184,134 $ 164,910 $ 154,664
Service revenues 23,394 19,136 18,019
Total Revenues 207,528 184,046 172,683
Cost of Revenues      
Cost of product revenues 84,045 78,823 72,839
Cost of service revenues 13,989 12,798 12,052
Total Cost of Revenues 98,034 91,621 84,891
Gross Margin 109,494 92,425 87,792
Operating Expenses      
Sales and marketing 40,791 35,026 30,020
General and administrative 20,216 17,024 15,112
Research and development 7,781 6,636 6,825
Operating Expenses, Total 68,788 58,686 51,957
Operating Income 40,706 33,739 35,835
Other Income (Expense)      
Interest income 144 107 95
Royalty income 364 329 317
Change in purchase consideration (14) 154 (787)
Other, net (59) (490) (265)
Nonoperating Income (Expense), Total 435 100 (640)
Income Before Income Taxes 41,141 33,839 35,195
Provision for Income Taxes 14,100 11,450 12,400
Net Income 27,041 22,389 22,795
Net Loss (Income) Attributable to Noncontrolling Interest 149 124 44
Net Income Attributable to Neogen $ 27,190 $ 22,513 $ 22,839
Net income attributable to Neogen per share      
Basic $ 1.14 $ 0.96 $ 0.99
Diluted $ 1.12 $ 0.94 $ 0.96