Revenue from Contracts with Customers - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Revenue from Contracts with Customers
Revenue	$ 88,619	$ 79,593	$ 237,582	$ 215,216
North America
Revenue from Contracts with Customers
Revenue	69,787	60,748	185,245	160,097
Asia/Middle East
Revenue from Contracts with Customers
Revenue	9,367	10,072	27,521	31,405
Europe
Revenue from Contracts with Customers
Revenue	8,389	7,922	22,486	21,381
All other foreign
Revenue from Contracts with Customers
Revenue	1,076	851	2,330	2,333
Adhesives, Sealants and Additives
Revenue from Contracts with Customers
Revenue	36,771	33,861	99,600	95,507
Adhesives, Sealants and Additives | North America
Revenue from Contracts with Customers
Revenue	24,015	20,497	62,992	56,606
Adhesives, Sealants and Additives | Asia/Middle East
Revenue from Contracts with Customers
Revenue	6,143	7,030	19,292	21,958
Adhesives, Sealants and Additives | Europe
Revenue from Contracts with Customers
Revenue	6,362	6,167	16,733	16,497
Adhesives, Sealants and Additives | All other foreign
Revenue from Contracts with Customers
Revenue	251	167	583	446
Industrial Tapes
Revenue from Contracts with Customers
Revenue	38,329	32,249	104,420	87,085
Industrial Tapes | North America
Revenue from Contracts with Customers
Revenue	34,044	28,620	93,321	76,429
Industrial Tapes | Asia/Middle East
Revenue from Contracts with Customers
Revenue	2,103	2,019	5,682	5,855
Industrial Tapes | Europe
Revenue from Contracts with Customers
Revenue	1,373	1,009	3,734	3,061
Industrial Tapes | All other foreign
Revenue from Contracts with Customers
Revenue	809	601	1,683	1,740
Corrosion Protection and Waterproofing
Revenue from Contracts with Customers
Revenue	13,519	13,483	33,562	32,624
Corrosion Protection and Waterproofing | North America
Revenue from Contracts with Customers
Revenue	11,728	11,631	28,932	27,062
Corrosion Protection and Waterproofing | Asia/Middle East
Revenue from Contracts with Customers
Revenue	1,121	1,023	2,547	3,592
Corrosion Protection and Waterproofing | Europe
Revenue from Contracts with Customers
Revenue	654	746	2,019	1,823
Corrosion Protection and Waterproofing | All other foreign
Revenue from Contracts with Customers
Revenue	$ 16	$ 83	$ 64	$ 147