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Inventories - Summary of inventories (Details) - USD ($)
$ in Thousands
Oct. 31, 2015
Jan. 31, 2015
Oct. 31, 2014
Inventory Disclosure [Abstract]      
Finished goods $ 507,602 $ 417,332 $ 429,531
Raw materials and work-in-process 2,772 8,848 6,836
Inventories $ 510,374 $ 426,180 $ 436,367