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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Aug. 31, 2011
Goodwill [Line Items]          
Carrying amounts of the Company's intangible assets $ 46.9   $ 46.9   $ 49.7
Amortization expense for intangible assets $ 1.5 $ 2.4 $ 4.5 $ 7.4  
Americas Fabrication [Member]
         
Goodwill [Line Items]          
Number of reporting unit in goodwill impairment test     2