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Inventories, net (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Inventory [Line Items]    
Raw materials $ 14,172 $ 14,767
Work-in-process 2,235 2,357
Finished goods 28,004 25,795
Inventory, Net, Total $ 44,411 $ 42,919