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Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 21, 2017
Apr. 30, 2019
May 01, 2018
Apr. 30, 2018
Apr. 30, 2017
Business Acquisition [Line Items]          
Goodwill   $ 25,888 $ 25,888 $ 25,888 $ 19,549
Halo          
Business Acquisition [Line Items]          
Cash consideration paid $ 9,250        
Purchase price 9,950        
Post-closing working capital adjustment 700        
Additional negative working capital adjustment 100        
Net assets acquired 9,150        
Business acquisition costs incurred   $ 149      
Goodwill $ 6,339