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Income Taxes - Valuation Allowance (Details)
$ in Thousands
12 Months Ended
Apr. 30, 2016
USD ($)
Summary of valuation allowance by jurisdiction  
Valuation Allowance, beginning of period $ 4,322
Change (697)
Valuation Allowance, end of period 3,625
U.S. state  
Summary of valuation allowance by jurisdiction  
Valuation Allowance, beginning of period 4,303
Change (697)
Valuation Allowance, end of period 3,606
Foreign  
Summary of valuation allowance by jurisdiction  
Valuation Allowance, beginning of period 19
Valuation Allowance, end of period $ 19