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Share-Based Compensation - Summary of the Activity for Unvested Stock Option Awards (Details) - $ / shares shares in Thousands | 12 Months Ended
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Jan. 27, 2019 | Jan. 28, 2018 | Jan. 29, 2017
Number of Shares |  |  |
Options granted (in shares) | 147 |  |
Weighted Average Exercise Price (per share) |  |  |
Beginning balance (in dollars per share) | $ 26.17 |  |
Options granted (in dollars per share) | 47.99 |  |
Options forfeited (in dollars per share) | 26.15 |  |
Ending balance (in dollars per share) | 29.03 | $ 26.17 |
Weighted Average Grant Date Fair Value (per share) |  |  |
Options granted (in dollars per share) | $ 14.53 | $ 10.70 | $ 5.71
Unvested Stock Options Award |  |  |
Number of Shares |  |  |
Beginning balance (in shares) | 534 |  |
Options granted (in shares) | 147 |  |
Options vested (in shares) | (261) |  |
Options forfeited (in shares) | (20) |  |
Ending balance (in shares) | 400 | 534 |
Weighted Average Exercise Price (per share) |  |  |
Beginning balance (in dollars per share) | $ 25.50 |  |
Options granted (in dollars per share) | 47.99 |  |
Options vested (in dollars per share) | 24.28 |  |
Options forfeited (in dollars per share) | 26.15 |  |
Ending balance (in dollars per share) | 34.52 | $ 25.50 |
Weighted Average Grant Date Fair Value (per share) |  |  |
Beginning balance (in dollars per share) | 7.10 |  |
Options granted (in dollars per share) | 14.53 |  |
Options vested (in dollars per share) | 6.86 |  |
Options forfeited (in dollars per share) | 7.30 |  |
Ending balance (in dollars per share) | $ 10.07 | $ 7.10 |

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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested in Period, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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