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Investments in Companies Accounted for Using the Equity Method - Altoy (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 01, 2017
Jul. 29, 2017
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Mar. 31, 2014
Equity Method Investments            
Entity's share of net loss   $ (1,283) $ (3,944) $ (1,283) $ (119)  
Altoy            
Equity Method Investments            
Total ownership interest 85.00%          
Altoy            
Equity Method Investments            
Ownership percentage           49.00%
Ownership interest acquired 36.00%          
Cash $ 625          
Altoy | Other income (expense)            
Equity Method Investments            
Entity's share of net loss       $ (119)