CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income (loss)	$ 42,014	$ 32,807	$ 26,413
Other comprehensive income:
Net unrealized gain (loss) on restricted investments, net of tax of $30, $4 and ($77), respectively	67	7	(162)
Change in funded status of pension plans, net of tax of $519, ($738) and ($697), respectively	(1,155)	1,402	1,149
Foreign currency translation adjustment	788	(6,098)	(2,425)
Total other comprehensive income (loss)	2,010	(7,493)	(3,736)
Comprehensive income	44,024	25,314	22,677
Comprehensive net (income) loss attributable to noncontrolling interest			(95)
Comprehensive income	$ 44,024	$ 25,314	$ 22,582