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Inventories (Tables)
3 Months Ended
Apr. 30, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories
    April 30, 2014     April 30, 2013     January 31, 2014  
    (In thousands)  
Finished goods   $ 310,907     $ 229,268     $ 350,627  
Raw materials and work-in-process     11,752       12,804       9,012  
    $ 322,659     $ 242,072     $ 359,639