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Mortgage Loans (Details Textual) (Financial Services [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Mortgage Loans [Abstract]          
Mortgage loans held for sale $ 419.2   $ 419.2   $ 395.1
Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement 408.2   408.2   381.1
Net gain on sales of loans 26.6 32.3 71.0 86.5  
Concentration Risk, Percentage     91.00%    
Percentage Of Mortgage Loans Sold To Major Purchasers     31.00%    
Interest rate lock commitments [Member]
         
Derivative [Line Items]          
Derivative, Notional Amount 395.4   395.4    
Best-efforts and mandatory commitments [Member]
         
Derivative [Line Items]          
Derivative, Notional Amount 28.0   28.0    
Hedging Instruments related to IRLCs [Member]
         
Derivative [Line Items]          
Derivative, Notional Amount 327.4   327.4    
Mortgage Loans [Abstract]          
Notional amounts of hedging instruments, Total 211.6   211.6    
Uncommitted Loans [Member]
         
Mortgage Loans [Abstract]          
Mortgage loans held for sale $ 212.5   $ 212.5