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Income Taxes (Components Of The Provision For Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Income Taxes [Abstract]      
Current, Federal $ 93,244 $ 127,390 $ 107,350
Current, State 14,199 19,492 13,216
Current, Foreign 8,287 6,095 1,786
Current income tax expense, total 115,730 152,977 122,352
Deferred, Federal (11,292) (6,698) 2,960
Deferred, State 124 (1,906) (365)
Deferred, Foreign (982) (123) (434)
Federal income tax expense, total (12,150) (8,727) 2,161
Income tax expense (benefit), total $ 103,580 $ 144,250 $ 124,513