Goodwill And Other Intangible Assets (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 28, 2014
Goodwill [Roll Forward]
Balance, August 31, 2013	$ 69,579
Foreign currency translation	211
Balance, February 28, 2014	69,790
Americas Recycling [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	7,267
Foreign currency translation	0
Balance, February 28, 2014	7,267
Americas Mills [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	295
Foreign currency translation	0
Balance, February 28, 2014	295
Americas Fabrication [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	57,144
Foreign currency translation	0
Balance, February 28, 2014	57,144
International Mill [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	2,755
Foreign currency translation	198
Balance, February 28, 2014	2,953
International Marketing and Distribution [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	2,118
Foreign currency translation	13
Balance, February 28, 2014	$ 2,131