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Adjusted Cost and Estimated Market Value Available-for-sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Mar. 31, 2012
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Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 754,941 |
Available-for-sale securities, fair value: |  |
Estimated market value | 793,382 | 766,792
U.S. treasury, government, and corporate securities |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 43,244 |
Due after one year through five years | 151,997 |
Due after five years through ten years | 187,143 |
Due after ten years | 312,566 |
Amortized cost | 694,950 |
Available-for-sale securities, fair value: |  |
Due in one year or less | 43,995 |
Due after one year through five years | 161,472 |
Due after five years through ten years | 200,440 |
Due after ten years | 338,569 |
Estimated market value | 744,476 |
Mortgage-backed securities |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 8,885 |
Available-for-sale securities, fair value: |  |
Estimated market value | 9,138 |
Redeemable preferred stock |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 23,370 |
Available-for-sale securities, fair value: |  |
Estimated market value | 23,935 |
Equity security investments |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 27,736 |
Available-for-sale securities, fair value: |  |
Estimated market value | $ 15,833 |

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