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Related Party Transactions (Details) (DBR [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
DBR [Member]
     
Related Party Transaction [Line Items]      
Fees paid $ 2,509 $ 2,707 $ 1,732
Fees due $ 273 $ 251 $ 251