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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Apr. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in the amount recorded as goodwill
The following table shows the changes in the amounts recorded as goodwill (which includes no accumulated impairment losses) over the past two years: 
Balance as of April 30, 2011
$
625

Foreign currency translation adjustment
(8
)
Balance as of April 30, 2012
617

Foreign currency translation adjustment
—

Balance as of April 30, 2013
$
617