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Stock-Based Awards - Narratives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 24, 2020 | Oct. 26, 2019 | Oct. 24, 2020 | Oct. 26, 2019 | Jan. 25, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Net tax (deficiency) benefit | $ 0.2 | $ 0.2 | $ 0.2 | $ (0.8) |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 1.9 |  | 1.9 |  |
Total compensation cost not yet recognized, period for recognition | 2 years 6 months |  |  |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 16.6 |  | $ 16.6 |  |
Total compensation cost not yet recognized, period for recognition | 2 years 8 months 12 days |  |  |  |
Granted (in shares) |  |  | 537,618 |  |
Shares outstanding | 646,257 |  | 646,257 |  | 174,917
Shares canceled (in shares) |  |  | 13,206 |  |
Performance RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options | $ 7.2 |  | $ 7.2 |  |
Total compensation cost not yet recognized, period for recognition | 1 year 2 months 12 days |  |  |  |
Compensation expense | $ 11.2 |  | $ 11.2 |  |
Granted (in shares) |  |  | 65,538 |  |
Shares outstanding | 429,618 |  | 429,618 |  | 639,738
Shares canceled (in shares) |  |  | 258,524 |  |
Target Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
RSUs outstanding (in shares) |  |  | 32,769 |  |
Shares outstanding | 286,151 |  | 286,151 |  |
Shares canceled (in shares) |  |  | 23,141 |  |
Supplemental Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 32,769 |  |
Shares outstanding | 143,467 |  | 143,467 |  |
Shares canceled (in shares) |  |  | 11,336 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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