Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Income Statement [Abstract]
Revenues	$ 755,953	$ 783,198	$ 1,354,683	$ 1,581,316
Operating expense:
Cost of goods sold	682,937	670,539	1,232,948	1,353,783
Selling, general and administrative	63,957	61,081	128,185	116,348
(Income) from joint ventures	(311)	(591)	(1,101)	(827)
Restructuring charges and other exit-related activities	828	4	2,420	26
Operating income (loss)	8,542	52,165	(7,769)	111,986
Interest expense	(4,908)	(1,901)	(8,232)	(3,273)
Other loss, net	(99)	(55)	(3,983)	(102)
Income (loss) from continuing operations before income taxes	3,535	50,209	(19,984)	108,611
Income tax benefit (expense)	513	(12,073)	6,545	(23,170)
Income (loss) from continuing operations	4,048	38,136	(13,439)	85,441
Income from discontinued operations, net of tax	224	29	155
Net income (loss)	4,272	38,165	(13,284)	85,441
Net loss (income) attributable to noncontrolling interests	81	(550)	(151)	(1,627)
Net income (loss) attributable to SSI shareholders	$ 4,353	$ 37,615	$ (13,435)	$ 83,814
Net income (loss) per share attributable to SSI shareholders Basic:
Income (loss) per share from continuing operations	$ 0.15	$ 1.33	$ (0.49)	$ 2.97
Net income (loss) per share	0.16	1.33	(0.48)	2.97
Net income (loss) per share attributable to SSI shareholders Diluted:
Income (loss) per share from continuing operations	0.14	1.27	(0.49)	2.81
Net income (loss) per share	$ 0.15	$ 1.27	$ (0.48)	$ 2.81
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic	28,081	28,231	27,912	28,195
Diluted	28,617	29,712	27,912	29,798