Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012	Aug. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amounts of the Company's intangible assets	$ 43.4		$ 43.4		$ 44.3
Amortization expense for intangible assets	$ 1.2	$ 1.5	$ 3.7	$ 4.5