Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Goodwill And Other Intangible Assets [Abstract]
Amortization expense of intangible assets	$ 7.1	$ 6.9	$ 14.3	$ 13.0
Future amortization expense, remainder of fiscal year 2012			14.7
Future amortization expense, 2013			27.7
Future amortization expense, 2014			26.0
Future amortization expense, 2015			26.0
Future amortization expense, 2016			25.8
Future amortization expense, thereafter			$ 178.4