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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 13, 2020
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Mar. 16, 2020
Subsequent Event [Line Items]          
Line of credit outstanding   $ 0      
Payments for repurchase and retired common stock   $ 217,421 $ 121,397 $ 157,044  
Subsequent Event          
Subsequent Event [Line Items]          
Number of common shares repurchased and subsequently retired 482,003        
Payments for repurchase and retired common stock $ 7,036        
Stock repurchased and retired during period average price $ 14.60        
Subsequent Event | COVID 19 Outbreak          
Subsequent Event [Line Items]          
Line of credit outstanding         $ 220,000