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Prepaid Expenses and Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013	Apr. 30, 2012
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	$ 0.3	$ 1.1
Other current assets	$ 0.8	$ 0.7

Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer.

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