Goodwill And Other Intangible Assets (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2013
Goodwill [Roll Forward]
Balance at August 31, 2012	$ 76,897
Foreign currency translation	(544)
Balance at May 31, 2013	76,353
Americas Recycling [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	7,267
Foreign currency translation	0
Balance at May 31, 2013	7,267
Americas Mills [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	295
Foreign currency translation	0
Balance at May 31, 2013	295
Americas Fabrication [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	57,144
Foreign currency translation	0
Balance at May 31, 2013	57,144
International Mill [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	2,685
Foreign currency translation	18
Balance at May 31, 2013	2,703
International Marketing and Distribution [Member]
Goodwill [Roll Forward]
Balance at August 31, 2012	9,506
Foreign currency translation	(562)
Balance at May 31, 2013	$ 8,944