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Commitments And Contingencies (Tables)
 3 Months Ended
Jul. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule Of Deferred Revenue Related To The Peace Of Mind Program
Changes in deferred revenue balances related to our Peace of Mind® Extended Service Plan (POM), which is included in deferred revenue and other liabilities in the consolidated balance sheets, are as follows:
(in 000s)
 
Three months ended July 31,
 
2015

 
2014

Balance, beginning of the period
 
$
158,169

 
$
145,237

Amounts deferred for new extended service plans issued
 
920

 
873

Revenue recognized on previous deferrals
 
(27,703
)
 
(24,253
)
Balance, end of the period
 
$
131,386

 
$
121,857