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Document and Entity Information
Dec. 23, 2019
Cover [Abstract]  
Entity Registrant Name NEOGEN CORP
Entity Incorporation, State or Country Code MI
Amendment Flag false
Entity Central Index Key 0000711377
Document Type 8-K
Document Period End Date Dec. 23, 2019
Entity File Number 0-17988
Entity Tax Identification Number 38-2367843
Entity Address, Address Line One 620 Lesher Place
Entity Address, City or Town Lansing
Entity Address, State or Province MI
Entity Address, Postal Zip Code 48912
City Area Code 517
Local Phone Number 372-9200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false