Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Earnings Per Share [Abstract]
Net income	$ 4,124	$ 1,554	$ 1,398	$ 8,855
Net income attributable to noncontrolling interests	(1,014)	(734)	(2,726)	(1,063)
Net income (loss) attributable to SSI	$ 3,110	$ 820	$ (1,328)	$ 7,792
Computation of shares:
Weighted average common shares outstanding, basic	26,853,000	26,671,000	26,811,000	26,629,000
Incremental common shares attributable to dilutive stock options, performance share awards, DSUs and RSUs	164,000	142,000	0	148,000
Weighted average common shares outstanding, diluted	27,017,000	26,813,000	26,811,000	26,777,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	501,511	601,547	1,184,755	583,747