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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Accumulated other comprehensive (loss) income      
Balance $ 311,160 $ 299,572 $ 299,434
Balance 514,606 311,160 299,572
Reclassification of (decrease) increase in fair value financial instruments from Accumulated other comprehensive income (loss)      
Amount expected to be reclassified to earnings during next twelve months 1,000    
Cash Flow Hedge      
Accumulated other comprehensive (loss) income      
Balance (1,148) 10  
Other comprehensive income (loss) before reclassification (118) (1,177) 10
Reclassification to earnings from accumulated other comprehensive (loss) income 382 19  
Balance $ (884) $ (1,148) $ 10