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Employee Stock Plans (Narrative) (Details)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Common stock available for issuance pursuant to future equity-based compensation awards 17.1  
Shares available for issuance under ESPP 7.9  
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