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Shareholder's Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Aug. 25, 2011
Jan. 31, 2011
Nov. 16, 2010
Feb. 28, 2006
Subsidiary, Sale of Stock [Line Items]                
Common shares authorized for repurchase, shares         10,000,000   10,000,000 8,000,000
Average cost per share $ 24.19 $ 31.06 $ 26.27 $ 31.92        
Stock repurchased and retired during period, common shares 13,326,354 4,273,267 20,491,530 6,288,447        
Stock repurchased and retired during period, value $ 322,318 $ 132,735 $ 538,311 $ 200,737        
Remaining common shares available for repurchase 0   0          
Additional paid-in-capital    10,165    10,165   27,603    
Retained earnings reduction related to shares repurchased 498,339   498,339          
From An Employee To Meet A Minimum Statutory Tax Withholding Requirement [Member]
               
Subsidiary, Sale of Stock [Line Items]                
Stock repurchased and retired during period, common shares       112,770        
Stock repurchased and retired during period, value       $ 3,986