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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Jan. 31, 2012
Jul. 31, 2011
Inventories      
Finished goods $ 326,420 $ 244,884 $ 312,179
Raw materials and work-in-process 9,969 8,637 10,208
Inventories $ 336,389 $ 253,521 $ 322,387