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Inventories (Tables)
6 Months Ended
Jul. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories
 
    July 31, 2014     July 31, 2013     January 31, 2014  
    (In thousands)  
Finished goods   $ 524,350     $ 395,600     $ 350,627  
Raw materials and work-in-process     9,836       10,646       9,012  
    $ 534,186     $ 406,246     $ 359,639