Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Intangible Assets [Abstract]
Intangible assets amortization expense	$ 400	$ 400	$ 758	$ 769