Summary of Significant Accounting Policies - Additional Information - Share-based Compensation (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |
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Apr. 29, 2017 |
Apr. 30, 2016 |
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| Employee Stock Option [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Number of shares granted | 103,000 | 105,000 |
| Compensation expenses | $ 2,142 | $ 1,983 |
| Weighted-average fair value of stock option | $ 70.12 | $ 52.55 |
| Unrecognized compensation cost | $ 24,899 | |
| Restricted Stock Units [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Unrecognized compensation cost | $ 19,299 | |
| Restricted stock units issued | 35,000 | 41,000 |
| Compensation expense | $ 2,099 | $ 1,561 |
| Performance Based Restricted Stock Units [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Unrecognized compensation cost | $ 13,016 | |
| Restricted stock units issued | 21,000 | 24,000 |
| Compensation expense | $ 1,250 | $ 478 |
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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.
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- Definition Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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