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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Accumulated other comprehensive (loss) income      
Balance $ 514,606 $ 311,160 $ 299,572
Balance 579,451 514,606 311,160
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 700    
Cash Flow Hedge      
Accumulated other comprehensive (loss) income      
Balance (884) (1,148) 10
Other comprehensive (loss) income before reclassification 309 (118) (1,177)
Reclassification to earnings from accumulated other comprehensive (loss) income 1,016 382 19
Balance $ 441 $ (884) $ (1,148)