v3.7.0.1
Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
USD ($)
Customer
Apr. 30, 2016
USD ($)
Customer
Apr. 30, 2015
USD ($)
Customer
Accounting Policies [Abstract]      
Foreign Currency Transaction Gain (Loss), before Tax $ (800) $ (400) $ (1,000)
Other than Temporary Impairment Losses, Investments 0 0 $ 0
Allowance for doubtful accounts $ 1,260 $ 2,362  
Number of clients that accounted for more than 10% of account receivables | Customer 0 0  
Number of clients that accounted for more than 10% of revenue | Customer 0 0 0
Stock-based expense $ 16,282 $ 15,086 $ 12,201