Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 13,297	$ 41,919	$ 29,915	$ 61,140
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	632	117	(732)	(1,592)
Pension obligations, net	40	(226)	242	(144)
Total other comprehensive income (loss), net of tax	672	(109)	(490)	(1,736)
Comprehensive income	13,969	41,810	29,425	59,404
Less comprehensive income attributable to noncontrolling interests	(405)	(903)	(835)	(1,760)
Comprehensive income attributable to SSI	$ 13,564	$ 40,907	$ 28,590	$ 57,644