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Long-Term Incentive Awards (Details) - Restated 2006 Plan - USD ($)
12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Long-term incentive awards | Key employees      
Long-Term Incentive Awards      
Compensation expense $ 0 $ 0 $ 160,000
Accrued compensation expense for outstanding awards 0 $ 0  
Maximum compensation expense that may be recorded for outstanding awards $ 6,409,000    
Three-year performance award      
Long-Term Incentive Awards      
Performance period 3 years 3 years 3 years