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Commitments And Contingencies (Schedule Of Future Minimum Lease Payments For Operating Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Commitments And Contingencies [Abstract]  
2013 $ 185,047
2014 183,374
2015 175,947
2016 160,574
2017 139,948
Thereafter 544,113
Total minimum lease payments $ 1,389,003