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Document and Entity Information
Aug. 17, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 17, 2020
Entity Registrant Name NEOGEN CORP
Entity Central Index Key 0000711377
Entity Emerging Growth Company false
Entity File Number 0-17988
Entity Incorporation, State or Country Code MI
Entity Tax Identification Number 38-2367843
Entity Address, Address Line One 620 Lesher Place
Local Phone Number 372-9200
Entity Address, State or Province MI
Entity Address, City or Town Lansing
City Area Code 517
Entity Address, Postal Zip Code 48912
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false