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Share Repurchase Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Equity, Class of Treasury Stock [Line Items]        
Total cost     $ 67,699  
Share Repurchase Programs        
Equity, Class of Treasury Stock [Line Items]        
Number of common shares repurchased and subsequently retired 1,500,000 3,083,201 1,500,000 8,092,906
Total cost $ 57,512 $ 66,533 $ 57,512 $ 157,044
Average cost per share, including commissions $ 38.34 $ 21.58 $ 38.34 $ 19.41