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Adjusted Cost and Estimated Market Value Available-for-sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 1,027,985 | $ 730,025
Available-for-sale securities, fair value: |  |
Estimated market value | 1,095,338 | 766,792
U.S. treasury, government, and corporate securities |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 43,658 | 40,219
Due after one year through five years | 180,448 | 157,444
Due after five years through ten years | 281,546 | 176,694
Due after ten years | 448,169 | 291,990
Amortized cost | 953,821 | 666,347
Available-for-sale securities, fair value: |  |
Due in one year or less | 44,333 | 40,688
Due after one year through five years | 191,930 | 165,852
Due after five years through ten years | 302,188 | 188,225
Due after ten years | 486,780 | 319,160
Estimated market value | 1,025,231 | 713,925
Mortgage-backed securities |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 6,730 | 11,572
Available-for-sale securities, fair value: |  |
Estimated market value | 6,985 | 11,811
Redeemable preferred stock |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 23,705 | 24,370
Available-for-sale securities, fair value: |  |
Estimated market value | 24,212 | 23,177
Common Stock |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 43,729 | 27,736
Available-for-sale securities, fair value: |  |
Estimated market value | $ 38,910 | $ 17,879

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