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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Income Taxes [Line Items]      
Net deferred tax assets $ 63,924 $ 52,143  
Net deferred tax assets, non-current 58,681 37,789  
Unrecognized tax benefit that, if recognized, would impact the effective tax rate 3,874 6,677  
Interest and penalties 1,334 437 427
Payment of interest and penalties accrued 2,529 3,620  
Unrecognized tax benefits, lower bound 0    
Unrecognized tax benefits, upper bound 3,340    
U.S. Federal [Member]
      
Income Taxes [Line Items]      
Net deferred tax assets 48,762 37,170  
State net operating loss carryforwards 9,114    
State Jurisdictions [Member]
      
Income Taxes [Line Items]      
Net deferred tax assets 12,374 13,546  
Foreign Jurisdictions [Member]
      
Income Taxes [Line Items]      
Net deferred tax assets 2,788 1,427  
State net operating loss carryforwards 10,503    
Undistributed earnings $ 130,219    
Maximum [Member] | U.S. Federal [Member]
      
Income Taxes [Line Items]      
Expiration date 2032    
Minimum [Member] | U.S. Federal [Member]
      
Income Taxes [Line Items]      
Expiration date 2016