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Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Income Taxes [Abstract]      
Balance at the beginning of the period $ 7,758 $ 7,532 $ 7,509
Increases in tax positions for prior years 3,466 43 948
Decreases in tax positions for prior years (310) (592) (116)
Increases in tax positions for current year 360 1,000 1,894
Settlements (2,259) (40) (924)
Lapse in statute of limitations (351) (185) (1,779)
Balance at the end of the period $ 8,664 $ 7,758 $ 7,532