Summary of Significant Accounting Policies - Additional Information - Accounting Changes (Detail) - USD ($) $ in Thousands  | 
3 Months Ended | 6 Months Ended | 
|---|---|---|
Jul. 29, 2017  | 
Jul. 29, 2017  | 
|
| Accounting Standards Update 2016-09 [Member] | ||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||
| New accounting pronouncement, Effect of adoption, Quantification | $ 1,406 | $ 9,139 | 
| X | ||||||||||
- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. No definition available. 
  | 
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
  | 
| X | ||||||||||
- Details 
  |