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Significant Accounting Policies Stock Compensation Activity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Oct. 21, 2010
Jun. 16, 2010
Sep. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           3,333
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       4,626 600  
Amortization of unearned restricted stock compensation $ 29,164 $ 30,389 $ 16,676      
Allocated Share-based Compensation Expense, Net of Tax 18,956 19,753 10,839      
Granted shares 863 1,674        
Granted, Grant Date Fair Value 24,408 48,530        
Restricted Stock [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Nonvested Awards Outstanding, Shares 13 123 446      
Nonvested Awards Outstanding, Weighted Average Grant Date Fair Value $ 28.00 $ 24.20 $ 23.56      
Nonvested Awards Outstanding, Grant Date Fair Value 364 2,977 10,508      
Vested, Shares (110) (323)        
Vested, Weighted Average Grant Date Fair Value $ 23.75 $ 23.32        
Vested, Grant Date Fair Value Value (2,613) (7,531)        
Restricted Stock Units (RSUs) [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Nonvested Awards Outstanding, Shares 1,931 1,645 249      
Nonvested Awards Outstanding, Weighted Average Grant Date Fair Value $ 28.45 $ 28.97 $ 28.22      
Nonvested Awards Outstanding, Grant Date Fair Value 54,931 47,656 7,028      
Granted, Shares 863 1,674        
Granted, Weighted Average Grant Date Fair Value $ 28.28 $ 28.99        
Granted, Grant Date Fair Value 24,408 48,530        
Vested, Shares (520) (235)        
Vested, Weighted Average Grant Date Fair Value $ 29.83 $ 28.23        
Vested, Grant Date Fair Value Value (15,509) (6,635)        
Forfeited, Shares (57) (43)        
Forfeitured, Weighted Average Grant Date Fair Value $ 28.49 $ 29.47        
Forfeitured, Grant Date Fair Value (1,624) (1,267)        
Time Based RSUs 2 Year Vesting [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted shares 160 93        
Performance Based RSUs 2 Year Vesting [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted shares   699        
Performance Based RSUs [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted shares 703 1,581        
Performance Based RSUs 3 Year Vesting [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted shares   882        
Termination Benefits [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Amortization of unearned restricted stock compensation 131 467 2,141      
Allocated Share-based Compensation Expense, Net of Tax $ 85 $ 304 $ 1,392