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Inventories
6 Months Ended
Jul. 31, 2014
Inventory Disclosure [Abstract]  
Inventories
4.
INVENTORIES

(in thousands)
 
July 31,
2014
 
January 31,
2014
 
July 31,
2013
Finished goods
 
$
1,453,175

 
$
1,333,926

 
$
1,370,966

Raw materials
 
933,311

 
874,799

 
843,380

Work-in-process
 
144,965

 
117,855

 
114,164

Inventories, net
 
$
2,531,451

 
$
2,326,580

 
$
2,328,510