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Segment Data (Details) $ in Thousands	3 Months Ended							6 Months Ended				8 Months Ended	9 Months Ended	12 Months Ended
Segment Data (Details) $ in Thousands	Aug. 31, 2020 USD ($)	May 31, 2020 USD ($)	Aug. 31, 2019 USD ($) segment	Feb. 28, 2019 USD ($)	Nov. 30, 2018 USD ($)	Aug. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Aug. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Aug. 31, 2019 USD ($)	Feb. 28, 2019 USD ($)	Aug. 31, 2018 USD ($)	Aug. 31, 2019 USD ($)	Aug. 31, 2020 USD ($) segment	Aug. 31, 2019 USD ($)	Aug. 31, 2018 USD ($)
Segment data
Revenue														$ 261,162	$ 281,351	$ 284,188
Income before income taxes														45,320	43,553	56,965
Total assets	$ 346,830		$ 307,968					$ 346,830		$ 307,968			$ 307,968	346,830	307,968
Interest														246	519	1,172
Depreciation														4,015	4,762	5,817
Amortization														$ 11,576	12,445	11,807
Loss on impairment of goodwill	0			$ 2,410											2,410
Number of operating segments \| segment			3											3
Severance costs		$ 183
Inventory Step up to Fair Value																1,070
Gain on sale of license																1,085
Write-down of certain assets under construction														$ 405
Expenses related to acquisition														274		393
Pension related settlement costs														(155)	(511)
Gain on sale of real estate (Note 19)														2,551
Exit costs related to facilities														807	986	1,272
Zappa Stewart
Segment data
Expenses related to acquisition							$ 393					$ 393
Pawtucket, RI manufacturing facility
Segment data
Gain on sale of real estate (Note 19)		760												760
Exit costs related to facilities		$ 85			$ 260	$ 1,272							0
Granite Falls Location
Segment data
Exit costs related to facilities								0	$ 559	526	$ 526
Randolph, MA - Property
Segment data
Gain on sale of real estate (Note 19)														1,791
Adhesives, Sealants and Additives
Segment data
Revenue														96,208	104,796	101,690
Income before income taxes														25,953	27,142	35,190
Total assets	129,457		$ 135,583					129,457		135,583			135,583	129,457	135,583
Interest														98	177	422
Depreciation														994	1,467	1,285
Amortization														9,313	9,359	7,895
Loss on impairment of goodwill				$ 2,410											2,410
Adhesives, Sealants and Additives \| Zappa Stewart
Segment data
Inventory Step up to Fair Value																1,070
Industrial Tapes
Segment data
Revenue														118,960	129,845	130,598
Income before income taxes														31,237	28,216	30,886
Total assets	71,229		77,085					71,229		77,085			77,085	71,229	77,085
Interest														111	216	516
Depreciation														1,746	1,755	2,748
Amortization														1,800	1,800	2,604
Gain on sale of license							$ 1,085
Industrial Tapes \| Pawtucket, RI manufacturing facility
Segment data
Exit costs related to facilities					$ 260											1,272
Industrial Tapes \| Granite Falls Location
Segment data
Exit costs related to facilities									$ 559	526
Industrial Tapes \| Structural composites product line
Segment data
Gain on sale of license																1,480
Corrosion Protection and Waterproofing
Segment data
Revenue														45,994	46,710	51,900
Income before income taxes														16,638	15,909	18,178
Total assets	32,642		32,478					32,642		32,478			32,478	32,642	32,478
Interest														37	126	234
Depreciation														615	674	753
Amortization														463	1,286	1,308
Construction Materials \| Engineering Studies related to Facility Consolidation and Rationalization Initiative
Segment data
Write-down on certain other structural composites assets															405
Gain on refund															170
Reportable segments
Segment data
Income before income taxes														73,828	71,267	84,254
Total assets	233,328		245,146					233,328		245,146			245,146	233,328	245,146
Corporate and common costs
Segment data
Income before income taxes														(28,508)	(27,714)	(27,289)
Total assets	$ 113,502		$ 62,822					$ 113,502		$ 62,822			$ 62,822	113,502	62,822
Severance costs														183
Expenses related to acquisition														274
Pension related settlement costs														155	511
Corporate and common costs \| Zappa Stewart
Segment data
Expenses related to acquisition																$ 393
Corporate and common costs \| Pawtucket, RI manufacturing facility
Segment data
Gain on sale of real estate (Note 19)														760
Exit costs related to facilities														85
Corporate and common costs \| Randolph, MA - Property
Segment data
Gain on sale of real estate (Note 19)														1,791
Corporate and common costs \| Engineering Studies related to Facility Consolidation and Rationalization Initiative
Segment data
Business development cost														$ 150	$ 200