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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 13, 2020
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Jun. 04, 2019
Aug. 22, 2017
Equity, Class of Treasury Stock [Line Items]            
Common shares authorized for repurchase, shares         20,000,000 20,000,000
Remaining common shares authorized for repurchase, shares   26,333,957        
Payments for repurchase and retired common stock   $ 217,421 $ 121,397 $ 157,044    
Stock repurchased and retired during period, total cost   $ (223,021) $ (131,642) $ (159,226)    
Employee Stock            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchased and retired during period shares   185,430 254,181      
Stock repurchased and retired during period, total cost   $ 5,600 $ 10,245      
Subsequent Event            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchased and retired during period shares 482,003          
Payments for repurchase and retired common stock $ 7,036          
Stock repurchased and retired during period average price $ 14.60