Goodwill And Other Intangible Assets (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 28, 2013
Goodwill [Roll Forward]
Balance at August 31, 2012	$ 76,897
Foreign currency translation	62
Balance at February 28, 2013	76,959
Americas Recycling [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	7,267
Foreign currency translation	0
Balance at February 28, 2013	7,267
Americas Mills [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	295
Foreign currency translation	0
Balance at February 28, 2013	295
Americas Fabrication [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	57,144
Foreign currency translation	0
Balance at February 28, 2013	57,144
International Mill [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	2,685
Foreign currency translation	116
Balance at February 28, 2013	2,801
International Marketing and Distribution [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	9,506
Foreign currency translation	(54)
Balance at February 28, 2013	$ 9,452