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Segment Reporting (Schedule Of Property And Equipment, By Domestic And Foreign Operation Segment) (Details) (USD $)
In Thousands
Jul. 31, 2011
Jan. 31, 2011
Jul. 31, 2010
Property and equipment, net $ 626,188 $ 586,346 $ 559,945
Domestic Operations [Member]
     
Property and equipment, net 517,430 497,521 490,176
Foreign Operations [Member]
     
Property and equipment, net $ 108,758 $ 88,825 $ 69,769