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Fair Value Measurements (Reconciliation Of Amortized Cost of Fair Value of Investments) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Sep. 30, 2012
Available-for-Sale Securities, Amortized Cost |  |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis | $ 2,003,858 |  | $ 1,760,668
Available-for-Sale Securities, Gross Unrealized Gains (Losses) |  |  |
Available-for-sale Securities, Gross Unrealized Gains | 20,308 |  | 22,161
Available-for-sale Securities, Gross Unrealized Losses | 1,498 |  | 1,124
Available-for-Sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities | 2,022,668 |  | 1,781,705
Available-for-Sale Securities, Yield |  |  |
Available-for-sale Securities, Yield | 1.61% |  | 1.99%
Held-to-maturity Securities, Yield | 3.04% |  | 3.10%
Yield | 2.22% |  | 2.44%
Held-to-Maturity Securities, Amortized Cost |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount | 1,469,983 |  | 1,191,487
Held-to-Maturity Securities, Gross Unrealized Gains |  |  |
Held-to-maturity Securities, Unrecognized Holding Gain | 3,302 |  | 25,736
Held-to-Maturity Securities, Gross Unrealized Losses |  |  |
Held-to-maturity Securities, Unrecognized Holding Loss | 4,056 |  | 0
Held-to-Maturity Securities, Fair Value |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value | 1,469,229 |  | 1,217,223
Investments | 3,473,841 |  | 2,952,155
Gross Unrealized Gains on Investments | 23,610 |  | 47,897
Gross Unrealized Losses on Investments | (5,554) |  | (1,124)
Investments, Fair Value Disclosure | 3,491,897 |  | 2,998,928
Available-for-sale securities sold | 43,199 | 3,500 |
Obligations of U.S. Government [Member] |  |  |
Available-for-Sale Securities, Yield |  |  |
1 to 5 years | 0.00% |  | 0.00%
Held-to-Maturity Securities, Amortized Cost |  |  |
5 to 10 years | 0 |  | 0
Held-to-Maturity Securities, Gross Unrealized Gains |  |  |
1 to 5 years | 0 |  | 0
Held-to-Maturity Securities, Gross Unrealized Losses |  |  |
1 to 5 years | 0 |  | 0
Held-to-Maturity Securities, Fair Value |  |  |
1 to 5 years | 0 |  | 0
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] |  |  |
Available-for-Sale Securities, Yield |  |  |
Agency pass-through certificates | 3.04% |  | 3.10%
Held-to-Maturity Securities, Amortized Cost |  |  |
Agency pass-through certificates | 1,469,983 |  | 1,190,692
Held-to-Maturity Securities, Gross Unrealized Gains |  |  |
Agency pass-through certificates | 3,302 |  | 25,729
Held-to-Maturity Securities, Gross Unrealized Losses |  |  |
Agency pass-through certificates | (4,056) |  | 0
Held-to-Maturity Securities, Fair Value |  |  |
Agency pass-through certificates | 1,469,229 |  | 1,216,421
Municipal Bonds [Member] |  |  |
Available-for-Sale Securities, Gross Unrealized Gains (Losses) |  |  |
Within 1 year | 0 |  | 7
Within 1 year | 0 |  | 0
Available-for-Sale Securities, Yield |  |  |
Within 1 year | 0.00% |  | 5.80%
1 to 5 years | 0.00% |  | 0.00%
5 to 10 years | 0.00% |  | 0.00%
Over 10 years | 0.00% |  | 0.00%
Held-to-Maturity Securities, Amortized Cost |  |  |
Within 1 year | 0 |  | 795
5 to 10 years | 0 |  | 0
5 to 10 years | 0 |  | 0
Over 10 years | 0 |  | 0
Held-to-Maturity Securities, Gross Unrealized Gains |  |  |
1 to 5 years | 0 |  | 0
5 to 10 years | 0 |  | 0
Over 10 years | 0 |  | 0
Held-to-Maturity Securities, Gross Unrealized Losses |  |  |
1 to 5 years | 0 |  | 0
5 to 10 years | 0 |  | 0
Over 10 years | 0 |  | 0
Held-to-Maturity Securities, Fair Value |  |  |
Within 1 year | 0 |  | 802
1 to 5 years | 0 |  | 0
5 to 10 years | 0 |  | 0
Over 10 years | 0 |  | 0
Municipal Bonds [Member] |  |  |
Available-for-Sale Securities, Amortized Cost |  |  |
Over 10 years | 20,430 |  | 20,442
Available-for-Sale Securities, Gross Unrealized Gains (Losses) |  |  |
Over 10 years | 4,373 |  | 4,402
Over 10 years | 0 |  | 0
Available-for-Sale Securities, Fair Value |  |  |
Over 10 years | 24,803 |  | 24,844
Available-for-Sale Securities, Yield |  |  |
Over 10 years | 6.45% |  | 6.45%
Obligations of U.S. Government [Member] |  |  |
Available-for-Sale Securities, Amortized Cost |  |  |
Within 1 year | 16,952 |  | 19,999
1 to 5 years | 58,000 |  | 0
5 to 10 years | 83,300 |  | 59,300
Over 10 years | 327,404 |  | 100,000
Available-for-Sale Securities, Gross Unrealized Gains (Losses) |  |  |
Within 1 year | 31 |  | 42
1 to 5 years | 2,576 |  | 0
5 to 10 years | 1,664 |  | 4,225
Over 10 years | 156 |  | 0
Within 1 year | (29) |  | (6)
1 to 5 years | 0 |  | 0
5 to 10 years | 0 |  | 0
Over 10 years | 0 |  | 0
Available-for-Sale Securities, Fair Value |  |  |
Within 1 year | 16,954 |  | 20,035
1 to 5 years | 60,576 |  | 0
5 to 10 years | 84,964 |  | 63,525
Over 10 years | 327,560 |  | 100,000
Available-for-Sale Securities, Yield |  |  |
Within 1 year | 0.45% |  | 0.57%
1 to 5 years | 1.55% |  | 0.00%
5 to 10 years | 1.36% |  | 2.21%
Over 10 years | 0.90% |  | 1.05%
Corporate Debt Securities [Member] |  |  |
Available-for-Sale Securities, Amortized Cost |  |  |
Within 1 year | 19,500 |  |
1 to 5 years | 317,044 |  | 336,340
5 to 10 years | 62,962 |  | 62,919
Available-for-Sale Securities, Gross Unrealized Gains (Losses) |  |  |
Within 1 year | 11 |  |
1 to 5 years | 4,078 |  | 2,810
5 to 10 years | 998 |  | 1,324
Within 1 year | 0 |  |
1 to 5 years | 0 |  | (61)
5 to 10 years | (481) |  | (7)
Available-for-Sale Securities, Fair Value |  |  |
Within 1 year | 19,511 |  |
1 to 5 years | 321,122 |  | 339,089
5 to 10 years | 63,479 |  | 64,236
Available-for-Sale Securities, Yield |  |  |
Within 1 year | 0.49% |  |
1 to 5 years | 0.84% |  | 0.91%
5 to 10 years | 2.02% |  | 2.73%
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] |  |  |
Available-for-Sale Securities, Amortized Cost |  |  |
Agency pass-through certificates | 1,098,266 |  | 1,161,668
Available-for-Sale Securities, Gross Unrealized Gains (Losses) |  |  |
Agency pass-through certificates | 6,421 |  | 9,358
Agency pass-through certificates | (988) |  | (1,050)
Available-for-Sale Securities, Fair Value |  |  |
Agency pass-through certificates | $ 1,103,699 |  | $ 1,169,976
Available-for-Sale Securities, Yield |  |  |
Agency pass-through certificates | 1.99% |  | 2.28%

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