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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Jan. 31, 2012
Oct. 31, 2011
Inventories      
Finished goods $ 299,797 $ 244,884 $ 265,224
Raw materials and work-in-process 7,680 8,637 7,937
Inventories $ 307,477 $ 253,521 $ 273,161