Stockholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended		1 Months Ended
	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jul. 25, 2012 Repurchase of common stock authorized [Member]	Jul. 27, 2012 Dividend declared [Member]
Stockholders' Equity [Abstract]
Amount of stock repurchase authorization					$ 100	$ 100
Amount remaining under stock repurchase authorization				$ 100
Cash dividends declared per common share	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.1125	$ 0.1125		$ 0.0375