Goodwill And Other Intangible Assets (Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2012
Goodwill [Roll Forward]
Balance at August 31, 2011	$ 77,638
Translation	(1,398)
Balance at May 31, 2012	76,240
Americas Recycling [Member]
Goodwill [Roll Forward]
Balance at August 31, 2011	7,267
Translation	0
Balance at May 31, 2012	7,267
Americas Mills [Member]
Goodwill [Roll Forward]
Balance at August 31, 2011	295
Translation	0
Balance at May 31, 2012	295
Americas Fabrication [Member]
Goodwill [Roll Forward]
Balance at August 31, 2011	57,144
Translation	0
Balance at May 31, 2012	57,144
International Mill [Member]
Goodwill [Roll Forward]
Balance at August 31, 2011	3,092
Translation	(582)
Balance at May 31, 2012	2,510
International Marketing and Distribution [Member]
Goodwill [Roll Forward]
Balance at August 31, 2011	9,840
Translation	(816)
Balance at May 31, 2012	$ 9,024