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Investments In Available-For-Sale Securities (Tables) | 9 Months Ended
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Jan. 31, 2012
Investments In Available-For-Sale Securities [Abstract] |
Amortized Cost And Fair Value Of Securities Available-For-Sale |
|  |  |  |  |  |  |  | (in 000s)
| January 31, 2012 | April 30, 2011
|  | Gross | Gross |  |  | Gross | Gross |
| Amortized | Unrealized | Unrealized | Fair | Amortized | Unrealized | Unrealized | Fair
As of | Cost | Gains | Losses (1) | Value | Cost | Gains | Losses (1) | Value
Short-term: |  |  |  |  |  |  |  |
Municipal bonds | $ 2,001 | $ 3 | $ — | $ 2,004 | $ 3,023 | $ 58 | $ — | $ 3,081
Long-term: |  |  |  |  |  |  |  |
Mortgage-backed securities | 303,519 | 3,243 | (287 ) | 306,475 | 157,970 | 401 | (194 ) | 158,177
Municipal bonds | 5,260 | 448 | — | 5,708 | 5,312 | 347 | — | 5,659
| 308,779 | 3,691 | (287 ) | 312,183 | 163,282 | 748 | (194 ) | 163,836
Total | $ 310,780 | $ 3,694 | $ (287 ) | $ 314,187 | $ 166,305 | $ 806 | $ (194 ) | $ 166,917
(1) At January 31, 2012 and April 30, 2011, we had no investments that had been in a continuous loss position for more than twelve months.
Contractual Maturities Of AFS Debt Securities At Varying Dates Over The Next 30 Years |
|  | (in 000s)
| Cost Basis | Fair Value
Maturing in: |  |
Less than one year | $ 2,001 | $ 2,004
Two to five years | 4,204 | 4,502
Six to ten years | 1,056 | 1,206
Beyond | 303,519 | 306,475
| $ 310,780 | $ 314,187

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- Definition Schedule Of Amortized Cost And Fair Value Of Securities Available-For-Sale [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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