Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Summary of Significant Accounting Policies - Additional Information - Share-based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     103,000 107,000
Compensation expenses $ 2,235 $ 1,999 $ 4,377 $ 3,982
Weighted-average fair value of stock option     $ 70.12 $ 52.72
Unrecognized compensation cost 22,633   $ 22,633  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 17,224   $ 17,224  
Restricted stock units issued     42,000 50,000
Compensation expense 2,354 1,884 $ 4,453 $ 3,445
Performance Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 11,617   $ 11,617  
Restricted stock units issued     21,000 24,000
Compensation expense $ 1,569 $ 957 $ 2,819 $ 1,435