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Cover Page Document - USD ($)
 12 Months Ended
Nov. 30, 2019
Jan. 22, 2020
May 31, 2019
Cover Page [Abstract]      
Document Type 10-K    
Document Period End Date Nov. 30, 2019    
Entity File Number 1-15147    
Entity Registrant Name OMNOVA Solutions Inc    
Entity Incorporation, State or Country Code OH    
Entity Tax Identification Number 34-1897652    
Entity Address, Address Line One 25435 Harvard Road    
Entity Address, City or Town  Beachwood    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 44122-6201    
Title of 12(b) Security Common Stock, par value 10¢ per share    
Trading Symbol OMN    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 246,135,108
Entity Common Stock, Shares Outstanding   44,853,699  
Entity Central Index Key 0001090061    
Current Fiscal Year End Date --11-30    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
City Area Code 216    
Local Phone Number 682-7000    
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
 
Portions of the 2020 Proxy Statement of OMNOVA Solutions Inc. are incorporated into Part III of this Report. 		   
Document Annual Report true    
Document Transition Report false