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Segment Reporting (Schedule Of Revenues And Long-Lived Assets, By Domestic And Foreign Operations Segment) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Segment Reporting Information [Line Items]      
Total net sales $ 2,473,801 $ 2,274,102 $ 1,937,815
Total property and equipment, net 684,979 586,346  
Domestic Operations [Member]
     
Segment Reporting Information [Line Items]      
Total net sales 2,169,976 2,027,074 1,752,787
Total property and equipment, net 557,512 497,521  
Foreign Operations [Member]
     
Segment Reporting Information [Line Items]      
Total net sales 303,825 247,028 185,028
Total property and equipment, net $ 127,467 $ 88,825