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Commitments And Contingencies (Schedule Of Deferred Revenue Related To The Peace Of Mind Program) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013
Movement in Deferred Revenue [Roll Forward] |  |
Balance, beginning of the year | $ 146,286 | $ 141,080
Amounts deferred for new guarantees issued | 88,636 | 76,561
Revenue recognized on previous deferrals | (89,685) | (71,355)
Balance, end of the year | $ 145,237 | $ 146,286

X
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