Goodwill and Intangibles Assets (Tables)

12 Months Ended

Aug. 31, 2017

Goodwill and Intangibles Assets

Schedule of changes in the carrying value of goodwill by operating segment

	Industrial Materials		Construction Materials		Consolidated
Balance at August 31, 2015	$	33,390	$	10,733	$	44,123
Acquisition of Spray Products (India) Private Limited		107		—		107
Foreign currency translation adjustment		(617)		(37)		(654)
Balance at August 31, 2016	$	32,880	$	10,696	$	43,576
Acquisition of Resin Designs, LLC		7,592		—		7,592
Sale of the fiber optic cable components business		(409)		—		(409)
Foreign currency translation adjustment		28		(3)		25
Balance at August 31, 2017	$	40,091	$	10,693	$	50,784

Schedule of intangible assets subject to amortization

	Weighted Average		Gross Carrying		Accumulated		Net Carrying
	Amortization Period		Value		Amortization		Value
August 31, 2017
Patents and agreements	14.4	years	$	1,845	$	1,671	$	174
Formulas and technology	7.8	years		9,318		5,387		3,931
Trade names	6.0	years		7,709		5,813		1,896
Customer lists and relationships	9.6	years		70,180		29,335		40,845
			$	89,052	$	42,206	$	46,846
August 31, 2016
Patents and agreements	14.5	years	$	1,805	$	1,663	$	142
Formulas and technology	8.4	years		8,248		4,310		3,938
Trade names	5.9	years		7,137		4,909		2,228
Customer lists and relationships	9.4	years		52,742		22,470		30,272
			$	69,932	$	33,352	$	36,580

Schedule of estimated amortization expense related to intangible assets

Years ending August 31,
2018	9,110
2019	8,441
2020	7,574
2021	7,044
2022	6,164