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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Jan. 31, 2021 USD ($) segment | Feb. 02, 2020 USD ($) | Feb. 03, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable | $ 100,699,000 | $ 80,478,000 |
Impairment charges | 0 | 0 | $ 0
Fulfillment costs | 871,000,000.0 | 546,200,000 | 403,900,000
Merchant processing fees | $ 146,000,000.0 | $ 101,000,000.0 | $ 74,100,000
Number of operating segments | segment | 1 |  |
Number of reportable segments | segment | 1 |  |
Products from three largest vendors | Revenue Benchmark | Product Concentration Risk |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Concentration risk percentage | 32.60% | 32.50% | 30.10%
Customer Receivables |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable | $ 81,100,000 | $ 58,300,000 |
Vendor Receivables |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts receivable | $ 19,600,000 | $ 22,200,000 |

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522 + Details
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