Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	May 31, 2011	May 31, 2010	May 31, 2011	May 31, 2010
Revenues	$ 981,062	$ 703,539	$ 2,378,008	$ 1,662,150
Operating expense:
Cost of goods sold	870,530	598,721	2,105,932	1,446,241
Selling, general and administrative	56,316	42,779	145,425	116,886
Environmental matters	532	141	332	(241)
(Income) loss from joint ventures	(1,648)	(1,877)	(3,389)	(2,330)
Operating income	55,332	63,775	129,708	101,594
Other income (expense):
Interest income	35	86	324	389
Interest expense	(3,127)	(503)	(4,883)	(1,816)
Other income, net	(66)	115	2,950	702
Total other income (expense)	(3,158)	(302)	(1,609)	(725)
Income (Loss) From Continuing Operations before IncomeTaxes, Extraordinary Items, Noncontrolling Interest	52,174	63,473	128,099	100,869
Income Tax Expense (Benefit)	18,056	21,715	42,965	33,315
Income from continuing operations before income taxes	34,118	41,758	85,134	67,554
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	282	23	317	(15,023)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	34,400	41,781	85,451	52,531
Net Income (Loss) Attributable to Noncontrolling Interest	1,372	1,328	3,804	3,188
Net Income (Loss) Attributable to Parent	$ 33,028	$ 40,453	$ 81,647	$ 49,343
Basic:
Income per share from continuing operations attributable to SSI	$ 1.18	$ 1.45	$ 2.95	$ 2.31
Income (loss) per share from discontinued operations attributable to SSI	$ 0.01	$ 0.00	$ 0.01	$ (0.54)
Net income per share attributable to SSI	$ 1.19	$ 1.45	$ 2.96	$ 1.77
Diluted:
Income per share from continuing operations attributable to SSI	$ 1.17	$ 1.43	$ 2.91	$ 2.28
Income (loss) per share from discontinued operations attributable to SSI	$ 0.01	$ 0.00	$ 0.01	$ (0.53)
Net income per share attributable to SSI	$ 1.18	$ 1.43	$ 2.92	$ 1.75
Weighted average number of common shares:
Basic	27,677	27,898	27,622	27,856
Diluted	27,998	28,211	27,952	28,177
Common Stock, Dividends, Per Share, Declared	$ 0.017	$ 0.017	$ 0.051	$ 0.051