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Inventories
3 Months Ended
Apr. 30, 2011
Inventories [Abstract]  
INVENTORIES
3.  
INVENTORIES
                         
    April 30,     January 31,     April 30,  
(in thousands)   2011     2011     2010  
Finished goods
  $ 1,035,988     $ 988,085     $ 943,527  
Raw materials
    565,724       534,879       435,456  
Work-in-process
    119,183       102,338       94,747  
 
                 
Inventories, net
  $ 1,720,895     $ 1,625,302     $ 1,473,730