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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%

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