Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 41,919	$ 11,699	$ 61,140	$ 10,991
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	117	240	(1,592)	(794)
Pension obligations, net	(226)	80	(144)	15
Total other comprehensive income (loss), net of tax	(109)	320	(1,736)	(779)
Comprehensive income	41,810	12,019	59,404	10,212
Less comprehensive income attributable to noncontrolling interests	(903)	(662)	(1,760)	(1,280)
Comprehensive income attributable to SSI	$ 40,907	$ 11,357	$ 57,644	$ 8,932