Document and Entity Information	6 Months Ended
	May 31, 2019 $ / shares shares
Document and Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	May 31, 2019
Entity File Number	1-15147
Entity Registrant Name	OMNOVA SOLUTIONS INC
Entity Tax Identification Number	341897652
Trading Symbol	OMN
Document Fiscal Year Focus	2019
Entity Common Stock, Shares Outstanding | shares	44,842,246
Entity Listing, Par Value Per Share | $ / shares	$ 0.10
Amendment Flag	false
Current Fiscal Year End Date	--11-30
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001090061
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes