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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jan. 31, 2012
Jan. 31, 2011
Consolidated Balance Sheets [Abstract]    
Allowance for doubtful accounts receivable $ 34,436 $ 32,174
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 80,000,000 40,000,000
Common stock, shares issued 20,279,132 20,056,132
Treasury stock, shares 492,225 367,225