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Inventories (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Jan. 31, 2018
Jul. 31, 2017
Inventory Net [Abstract]      
Finished goods $ 129,587 $ 112,712 $ 132,659
Component parts 39,880 37,404 41,932
Work-in-process 1,950 1,560 2,376
Inventories $ 171,417 $ 151,676 $ 176,967