Intangible and Other Assets, Net (Details Textual)	9 Months Ended
	Jan. 31, 2013
Deferred Order Entry Costs, Amortization Period	twelve months
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets, Useful Life (in years)	5 years
Customer Contracts and Relationships [Member]
Finite-Lived Intangible Assets, Useful Life (in years)	12 years