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Intangible Assets (Schedule Of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Apr. 30, 2014
Intangible Assets [Abstract]    
Remainder of 2015 $ 379us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 1,096us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 814us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 774us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 774us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 642us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Finite-lived intangible assets, Net carrying amount $ 4,479us-gaap_FiniteLivedIntangibleAssetsNet $ 5,614us-gaap_FiniteLivedIntangibleAssetsNet