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Fair Value Measurements (Investments by Contractual Maturity Date) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Amortized Cost, Available-for-sale securities      
Amortized Cost $ 3,093,990   $ 2,350,864
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains 23,739   19,686
Gross unrealized loss (7,154)   (9,602)
Fair Value, Available-for-sale securities      
Fair Value 3,110,575   2,360,948
Yield, Available-for-sale securities      
Yield 2.09%   1.70%
Yield, Held-to-maturity securities      
Investments 4,705,293   4,005,530
Gross unrealized gains on investments 25,358   23,073
Gross unrealized losses on investments 92,545   84,806
Fair value of investments 4,638,106   3,943,797
Yield on investments 2.44%   2.30%
Available-for-sale securities sold 0 43,199  
Term of contractual due dates of substantially all mortgage-backed securities 10 years    
US Treasury and Government [Member]
      
Amortized Cost, Available-for-sale securities      
1 to 5 years 111,002   61,002
5 to 10 years 143,562   129,219
Over 10 years 524,826   344,571
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, 1 to 5 years 2,933   3,393
Gross unrealized gains, 5 to 10 years 863   0
Gross unrealized gains, Over 10 years 1,284   0
Gross unrealized losses, 1 to 5 years (1,035)   (252)
Gross unrealized losses, 5 to 10 years (244)   (1,547)
Gross unrealized losses, Over 10 years (934)   (2,411)
Fair Value, Available-for-sale securities      
1 to 5 years 112,900   64,143
5 to 10 years 144,181   127,672
Over 10 years 525,176   342,160
Yield, Available-for-sale securities      
1 to 5 years 1.58%   1.98%
5 to 10 years 1.55%   0.86%
Over 10 years 1.51%   0.93%
Equity Securities [Member]
      
Amortized Cost, Available-for-sale securities      
Within 1 year 500    
1 to 5 years 100,000   500
5 to 10 years 0   100,000
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Within 1 year 6    
Gross unrealized gains, 1 to 5 years 990   11
Gross unrealized gains, 5 to 10 years 0   726
Gross unrealized losses, Within 1 year 0    
Gross unrealized losses, 1 to 5 years 0   0
Gross unrealized losses, 5 to 10 years 0   0
Fair Value, Available-for-sale securities      
Within 1 year 506    
1 to 5 years 100,990   511
5 to 10 years 0   100,726
Yield, Available-for-sale securities      
Within 1 year 2.17%    
1 to 5 years 1.80%   2.17%
5 to 10 years 0.00%   1.80%
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
      
Amortized Cost, Available-for-sale securities      
Without single maturity date 1,703,893   1,245,400
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Without single maturity date 10,746   10,270
Gross unrealized losses, Without single maturity date (4,766)   (4,494)
Fair Value, Available-for-sale securities      
Without single maturity date 1,709,873   1,251,176
Yield, Available-for-sale securities      
Without single maturity date 2.59%   2.18%
Amortized Cost, Held-to-maturity securities      
Without single maturity date 1,611,303   1,654,666
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains, Without single maturity date 1,619   3,387
Gross unrealized losses, Without single maturity date (85,391)   (75,204)
Fair Value, Held-to-maturity securities      
Without single maturity date 1,527,531   1,582,849
Yield, Held-to-maturity securities      
Without a single maturity date 3.13%   3.14%
Other Commercial Mortgage-Backed Securities [Member]
      
Amortized Cost, Available-for-sale securities      
Without single maturity date 59,300    
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Without single maturity date 167    
Gross unrealized losses, Without single maturity date 0    
Fair Value, Available-for-sale securities      
Without single maturity date 59,467    
Yield, Available-for-sale securities      
Without single maturity date 1.69%    
Corporate Debt Securities [Member]
      
Amortized Cost, Available-for-sale securities      
Within 1 year 0   19,500
1 to 5 years 317,365   317,190
5 to 10 years 113,130   113,060
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Within 1 year 0   3
Gross unrealized gains, 1 to 5 years 2,785   1,980
Gross unrealized gains, 5 to 10 years 1,465   1,180
Gross unrealized losses, Within 1 year 0   0
Gross unrealized losses, 1 to 5 years 0   (130)
Gross unrealized losses, 5 to 10 years (175)   (768)
Fair Value, Available-for-sale securities      
Within 1 year 0   19,503
1 to 5 years 320,150   319,040
5 to 10 years 114,420   113,472
Yield, Available-for-sale securities      
Within 1 year 0.00%   0.49%
1 to 5 years 0.75%   0.75%
5 to 10 years 1.53%   1.53%
Municipal Bonds [Member]
      
Amortized Cost, Available-for-sale securities      
Over 10 years 20,412   20,422
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, Over 10 years 2,500   2,123
Gross unrealized losses, Over 10 years 0   0
Fair Value, Available-for-sale securities      
Over 10 years $ 22,912   $ 22,545
Yield, Available-for-sale securities      
Over 10 years 6.45%   6.45%