Goodwill And Other Intangible Assets (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2013
Goodwill [Roll Forward]
Balance, August 31, 2013	$ 69,579
Foreign currency translation	154
Balance, November 30, 2013	69,733
Americas Recycling [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	7,267
Foreign currency translation	0
Balance, November 30, 2013	7,267
Americas Mills [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	295
Foreign currency translation	0
Balance, November 30, 2013	295
Americas Fabrication [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	57,144
Foreign currency translation	0
Balance, November 30, 2013	57,144
International Mill [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	2,755
Foreign currency translation	121
Balance, November 30, 2013	2,876
International Marketing and Distribution [Member]
Goodwill [Roll Forward]
Balance, August 31, 2013	2,118
Foreign currency translation	33
Balance, November 30, 2013	$ 2,151