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Stock Award Plans - Option Activity (Details) (Employee Stock Option [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Employee Stock Option [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options outstanding at beginning of period 2,300,106  
Options granted 0  
Options exercised (236,691)  
Options forfeited (159,837)  
Options outstanding at end of period 1,903,578 2,300,106
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Options outstanding, weighted average exercise price at beginning of period $ 20.60  
Options granted, weighted average exercise price $ 0.00  
Options exercised, weighted average exercise price $ 18.12  
Options forfeited, weighted average exercise price $ 20.31  
Options outstanding, weighted average exercise price at end of period $ 20.93 $ 20.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Options exercisable 1,615,828  
Options exercisable, weighted average exercise price $ 21.82  
Options outstanding, weighted average remaining contractual term 4 years 4 years
Options exercisable, weighted average remaining contractual term 3 years  
Options outstanding, aggregate intrinsic value $ 2,563 $ 1,269
Options exercisable, aggregate intrinsic value $ 1,196