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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 28, 2018 | Oct. 29, 2017 | Jan. 27, 2019 | Jan. 28, 2018 | Jan. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Transfers of financial assets or liabilities between levels |  |  | $ 0 | $ 0 |
Impairment of investments | $ 30,000,000 | $ 4,300,000 | 30,000,000 | $ 4,250,000 | $ 0
Fair value of investment | $ 0 |  |  |  |
Level 2 | Term loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt |  |  | 115,300,000 |  |
Level 2 | Revolving loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt |  |  | $ 97,000,000 |  |
Valuation Technique, Discounted Cash Flow | Measurement Input, Cap Rate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment, measurement input | 38.80% |  |  |  |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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