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Adjusted Cost and Estimated Market Value Available-for-sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Mar. 31, 2012
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Available-for-sale securities, amortized cost: |  |
Due in one year or less | $ 51,141 |
Due after one year through five years | 148,038 |
Due after five years through ten years | 217,112 |
Due after ten years | 368,697 |
Amortized cost | 855,141 |
Available-for-sale securities, fair value: |  |
Due in one year or less | 52,289 |
Due after one year through five years | 157,500 |
Due after five years through ten years | 233,269 |
Due after ten years | 401,347 |
Estimated market value | 904,446 | 766,792
Mortgage-backed securities |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 18,244 |
Available-for-sale securities, fair value: |  |
Estimated market value | 18,654 |
Redeemable preferred stock |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 24,147 |
Available-for-sale securities, fair value: |  |
Estimated market value | 24,558 |
Common Stock [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 27,762 |
Available-for-sale securities, fair value: |  |
Estimated market value | $ 16,829 |

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