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Inventories (Details) - USD ($)
$ in Thousands
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Inventory Net [Abstract]      
Finished goods $ 134,421 $ 117,627 $ 135,112
Component parts 47,717 41,041 48,505
Work-in-process 3,952 3,797 4,898
Inventories $ 186,090 $ 162,465 $ 188,515