Asset Impairments and Sales	12 Months Ended
Nov. 30, 2018
Asset Impairment Charges [Abstract]
Asset Sales & Impairment [Text Block]	Asset Impairments and Sales of Businesses During 2018, the Company's Board of Directors approved a plan to close the Green Bay, Wisconsin plant shifting styrene butadiene manufacturing to its production plant in Mogadore, Ohio. The Company expects to complete the plant closure by the end of the third quarter of 2019. As a result, the Company determined that certain plant and equipment were impaired and recognized an impairment charge of $9.2 million, primarily in the Performance Materials segment, to write-down the asset group to fair value based on the market approach analysis. The asset groups' remaining fair value of $2.5 million is being depreciated over the remaining estimated useful lives of the impacted assets and is primarily included in the Performance Materials segment operating results. Also during 2018, the Company recognized other asset impairment charges of $2.7 million related to idled assets within the Performance Materials segment. During 2016, due to changes in markets and expected lower capacity utilization at the China Coated Fabrics manufacturing facility ("CCF"), the Company performed an impairment analysis of this asset group. Based on this analysis, it was determined that the fair value of the asset group was less than book value, and accordingly, the Company recognized an impairment charge of $5.4 million within the Performance Materials segment and reduced Property, Plant, and Equipment by $5.2 million and intangible assets by $0.2 million. The CCF manufacturing facility also recognized $0.3 million of impairment charges during 2016 related to idled equipment within the Performance Materials segment. During 2017, Management approved a plan for the Company to sell its CCF manufacturing operations. As a result, during the second quarter of 2017, the Company determined that the disposal group was impaired and recognized an additional impairment charge of $12.9 million, of which $11.8 million was included in the results of the Performance Materials segment and $1.1 million was included in Corporate expenses. Included in the calculation of the impairment charge were deferred foreign currency translation gains of $6.3 million, which were previously recorded in accumulated other comprehensive income ("AOCI"). Accordingly, the assets and liabilities of the CCF manufacturing facility were reclassified to held for sale in the consolidated balance sheet as of November 30, 2016. The Company completed the planned sale in July 2017, and recognized an additional loss on the sale of $0.4 million, for a total loss of $13.3 million. The Company continues to manufacture and sell coated fabric products in the Asian region. Management considered other qualitative and quantitative factors and concluded this sale did not represent a strategic shift in business. During 2016, the Company completed the sale of its India operations (through the sale of 100% of the equity outstanding of the Company's OMNOVA Solutions India Private Limited Subsidiary) to Apcotex Inc., a private industrial products manufacturer headquartered in India. The sale included all assets and liabilities, contracts and other assets associated with the Company’s production of rubber related products. Under terms of the sale, the Company received $5.2 million in cash. The sale price was equal to the net book value of these assets and liabilities and therefore, there was no gain or loss recognized on this transaction. The Company continues to sell certain of its products within India through its other subsidiaries in the ordinary course of business.

Asset Impairments and Sales of Businesses

During 2018, the Company's Board of Directors approved a plan to close the Green Bay, Wisconsin plant shifting styrene butadiene manufacturing to its production plant in Mogadore, Ohio. The Company expects to complete the plant closure by the end of the third quarter of 2019. As a result, the Company determined that certain plant and equipment were impaired and recognized an impairment charge of $9.2 million, primarily in the Performance Materials segment, to write-down the asset group to fair value based on the market approach analysis. The asset groups' remaining fair value of $2.5 million is being depreciated over the remaining estimated useful lives of the impacted assets and is primarily included in the Performance Materials segment operating results. Also during 2018, the Company recognized other asset impairment charges of $2.7 million related to idled assets within the Performance Materials segment.

During 2016, due to changes in markets and expected lower capacity utilization at the China Coated Fabrics manufacturing facility ("CCF"), the Company performed an impairment analysis of this asset group. Based on this analysis, it was determined that the fair value of the asset group was less than book value, and accordingly, the Company recognized an impairment charge of $5.4 million within the Performance Materials segment and reduced Property, Plant, and Equipment by $5.2 million and intangible assets by $0.2 million. The CCF manufacturing facility also recognized $0.3 million of impairment charges during 2016 related to idled equipment within the Performance Materials segment.

During 2017, Management approved a plan for the Company to sell its CCF manufacturing operations. As a result, during the second quarter of 2017, the Company determined that the disposal group was impaired and recognized an additional impairment charge of $12.9 million, of which $11.8 million was included in the results of the Performance Materials segment and $1.1 million was included in Corporate expenses. Included in the calculation of the impairment charge were deferred foreign currency translation gains of $6.3 million, which were previously recorded in accumulated other comprehensive income ("AOCI"). Accordingly, the assets and liabilities of the CCF manufacturing facility were reclassified to held for sale in the consolidated balance sheet as of November 30, 2016. The Company completed the planned sale in July 2017, and recognized an additional loss on the sale of $0.4 million, for a total loss of $13.3 million. The Company continues to manufacture and sell coated fabric products in the Asian region. Management considered other qualitative and quantitative factors and concluded this sale did not represent a strategic shift in business.

During 2016, the Company completed the sale of its India operations (through the sale of 100% of the equity outstanding of the Company's OMNOVA Solutions India Private Limited Subsidiary) to Apcotex Inc., a private industrial products manufacturer headquartered in India. The sale included all assets and liabilities, contracts and other assets associated with the Company’s production of rubber related products. Under terms of the sale, the Company received $5.2 million in cash. The sale price was equal to the net book value of these assets and liabilities and therefore, there was no gain or loss recognized on this transaction. The Company continues to sell certain of its products within India through its other subsidiaries in the ordinary course of business.