XML 15 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - USD ($)
12 Months Ended
May 31, 2019
Jun. 30, 2019
Nov. 30, 2018
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date May 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --05-31    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
Entity Registrant Name NEOGEN CORP    
Entity Central Index Key 0000711377    
Trading Symbol NEOG    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Shell Company false    
Entity Small Business false    
Entity Public Float     $ 3,378,030,000
Entity Emerging Growth Company false    
Entity Common Stock, Shares Outstanding   52,281,700  
Title of 12(g) Security COMMON STOCK    
Entity Address, State or Province MI    
Security Exchange Name NASDAQ