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Share-Based Compensation - Share-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Share Based Compensation [Abstract]        
Stock Options $ 215 $ 105 $ 571 $ 316
Restricted Stock Awards and Restricted Stock Units 290 436 757 800
Employee Stock Purchase Plan 5 3 11 9
Total $ 510 $ 544 $ 1,339 $ 1,125