Segment Data and Foreign Operations - Revenue and Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019	Aug. 31, 2019
Concentration risk
Revenue	$ 65,582	$ 66,631	$ 132,384	$ 139,134
Property, plant and equipment, net	27,375		27,375		$ 29,326
Goodwill and Intangible assets, less accumulated amortization	129,107		129,107		134,690
United States
Concentration risk
Revenue	57,236	57,942	115,597	122,293
Property, plant and equipment, net	24,041		24,041		24,993
Goodwill and Intangible assets, less accumulated amortization	123,466		123,466		129,057
United Kingdom
Concentration risk
Revenue	4,788	4,428	9,419	8,444
Property, plant and equipment, net	2,425		2,425		2,493
Goodwill and Intangible assets, less accumulated amortization	4,457		4,457		4,446
All other Foreign
Concentration risk
Revenue	3,558	$ 4,261	7,368	$ 8,397
Property, plant and equipment, net	909		909		1,840
Goodwill and Intangible assets, less accumulated amortization	$ 1,184		$ 1,184		$ 1,187

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