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Share Repurchase Program (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Apr. 30, 2018
Jul. 31, 2018
Dec. 04, 2015
Jul. 16, 2008
Mar. 09, 2006
Accelerated Share Repurchases [Line Items]              
Number of shares authorized to repurchase 7,500,000           3,000,000
Treasury Stock, Shares, Acquired 197,896   197,896        
Additional number of shares authorized to repurchase         1,500,000 3,000,000  
Number of shares repurchased since inception 5,750,000 5,436,000   5,552,000      
Payments for Repurchase of Common Stock $ 50,000 $ 0          
Value of stock repurchased since inception $ 322,989 $ 247,189   $ 272,989      
Remaining shares available for repurchase under existing program 1,750,388