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Prepaid Expenses and Other Current Assets	6 Months Ended
Prepaid Expenses and Other Current Assets	Oct. 31, 2012
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid Expenses and Other Current Assets	3. Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets at October 31, 2012 consisted of prepaid expenses of $0.6 million and other current assets of $0.7 million. Prepaid expenses and other current assets at April 30, 2012 consisted of prepaid expenses of $1.1 million and other current assets of $0.7 million.