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Summary of Significant Accounting Policies - Acquisition (Details) $ / shares in Units, € in Thousands, $ in Thousands						1 Months Ended		3 Months Ended								6 Months Ended				9 Months Ended	12 Months Ended
	Nov. 06, 2020 $ / shares	Sep. 01, 2020 EUR (€)	Sep. 01, 2020 USD ($)	Jun. 25, 2018	Dec. 31, 2017 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2017 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Nov. 30, 2019 USD ($)	Nov. 30, 2018 USD ($)	Aug. 31, 2018 USD ($)	May 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, 2019 USD ($)	Aug. 31, 2020 USD ($) $ / shares	Aug. 31, 2019 USD ($) $ / shares	Aug. 31, 2018 USD ($) $ / shares	Sep. 01, 2020 USD ($)	Apr. 20, 2018 USD ($)
Basis of Presentation
Severance costs									$ 183
Percentage of temporary reduction in the base salaries of its named Executive Officers and select members of Senior Management, as well as the cash compensation of the non-employee members of the Board									20.00%
Exit costs related to facilities																					$ 807	$ 986	$ 1,272
Proceeds from sale of businesses																						$ 400	$ 2,232
Annual cash dividends declared per share \| $ / shares	$ 0.80																				$ 0.80	$ 0.80	$ 0.80
Asset Impairment Charges																					$ 405
Gain on sale of property																					2,551
Granite Falls Location
Basis of Presentation
Exit costs related to facilities																$ 0	$ 559	$ 526	$ 526
Structural Composites Rod Business
Basis of Presentation
Total proceeds received or to be received																									$ 2,232
Gain on assets sold														$ 1,480
Proceeds from sale of businesses													$ 157	$ 2,075
Pawtucket, RI manufacturing facility
Basis of Presentation
Exit costs related to facilities									$ 85			$ 260	$ 1,272							$ 0
Anticipated future exit costs									0
Proceeds from the sale of property						$ 1,810			1,810
Gain on sale of property									760												760
Transition period				2 months
Zappa Stewart
Basis of Presentation
Acquisition related expenses															$ 393
Purchase price					$ 73,469		$ 73,469
Subsequent Events \| ABchime
Basis of Presentation
Consideration paid in cash		€ 18,000	$ 21,420
Acquisition related expenses			$ 274
Potential earn out		€ 7,000																						$ 8,330
Minimum \| Zappa Stewart
Basis of Presentation
Combined revenue					$ 24,000
Engineering Studies related to Facility Consolidation and Rationalization Initiative
Basis of Presentation
Business development cost								$ 0	$ 0	$ 0	$ 150											$ 200
Gain on refund																					170
Asset Impairment Charges																					405
Gain on sale of property																					$ 170