Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information - Share-based Compensation (Detail)

v3.5.0.2
Summary of Significant Accounting Policies - Additional Information - Share-based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 29, 2016
Oct. 31, 2015
Oct. 29, 2016
Oct. 31, 2015
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     109,000 295,000
Compensation expenses $ 1,983 $ 1,743 $ 5,965 $ 5,682
Weighted-average grant date fair value of stock option     $ 52.95 $ 57.40
Unrecognized compensation cost 22,054   $ 22,054  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 13,452   $ 13,452  
Number of shares granted     52,000 55,000
Compensation expense 1,890 1,401 $ 5,335 $ 4,558
Performance Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 9,783   $ 9,783  
Number of shares granted     24,000 22,000
Compensation expense $ 1,468 $ 404 $ 2,903 $ 886