Employee Stock Plans (Narrative) (Details) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Sep. 30, 2012
Options and Restricted Stock Units (RSUs) [Member]
Common stock available for issuance pursuant to future equity-based compensation awards	17.7
Employee Stock [Member]
Shares available for issuance under ESPP	7.8
Deferred Stock Plan [Member]
Shares deferred under 1997 Deferred Stock Plan		3.4
Deferred shares issued under 1997 Deferred Stock Plan	2.2
Deferred shares withheld to satisfy tax withholdings	1.2