Summary of Significant Accounting Policies	3 Months Ended
May 05, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Other than policies noted within Recent Accounting Pronouncements below, there have been no significant changes from the significant accounting policies disclosed in Note 2 of the “Notes to Consolidated Financial Statements” included in the Prospectus. Use of Estimates GAAP requires management to make certain estimates, judgments, and assumptions that affect reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, management evaluates these estimates and judgments. Actual results could differ from those estimates. Key estimates relate primarily to determining the net realizable value and demand for inventory, useful lives associated with property and equipment, valuation allowances with respect to deferred tax assets, contingencies and the valuation and assumptions underlying share-based compensation. On an ongoing basis, management evaluates its estimates compared to historical experience and trends, which form the basis for making judgments about the carrying value of assets and liabilities. Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements ASU 2016-02, Leases. In February 2016, the FASB issued this Accounting Standards Update (“ASU”) to provide a comprehensive lease accounting model that requires lessees to recognize lease liabilities and corresponding right-of-use assets for most leases. The new guidance also changes the definition of a lease and requires enhanced disclosures of pertinent quantitative and qualitative information about an entity’s leasing activities. The FASB subsequently issued ASU 2018-10 allowing entities to initially apply ASU 2016-02 at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. These ASUs became effective at the beginning of the Company’s 2019 fiscal year. The Company adopted this ASU by applying the new guidance to new and existing leases effective February 4, 2019, with no restatement of comparative periods. The Company elected the package of practical expedients, which permitted the Company to not reassess under the new standard its prior conclusions about lease identification, lease classification and initial direct costs. The Company also made an accounting policy election to not recognize right-of-use assets and lease liabilities arising from short-term leases on its condensed consolidated balance sheets. The adoption of this ASU did not result in a cumulative effect adjustment to accumulated deficit. Upon adoption, the Company recognized operating lease right-of-use assets of $162.8 million and operating lease liabilities of $193.6 million. The adoption of this new guidance did not have a material net impact on the Company’s condensed consolidated statements of operations or condensed consolidated statements of cash flows. The Company has operating and finance lease agreements for its fulfillment and customer service centers, corporate offices, and certain equipment. The Company determines if an arrangement contains a lease at inception based on the ability to control a physically distinct asset. Operating and finance lease right-of-use assets are recorded in the condensed consolidated balance sheets based on the initial measurement of the lease liability as adjusted to include prepaid rent and initial direct costs less any lease incentives received. Lease liabilities are measured at the commencement date based on the present value of the lease payments over the lease term. Lease payments are generally fixed but may include provisions for future rent increases based on a market index. The Company separately accounts for lease and non-lease components within lease agreements; the non-lease components primarily relate to common area maintenance for real estate leases. The Company uses its incremental borrowing rate to present value the lease liability as key inputs to determine the interest rate implicit in the lease are not shared by lessors. Operating lease expense is recorded on a straight-line basis over the lease term. Right-of-use assets and lease liabilities for short-term leases are not recognized in the condensed consolidated balance sheets. Payments for short-term leases are recognized in the condensed consolidated statements of operations on a straight-line basis over the lease term. ASU 2018-07, Stock Compensation; Improvements to Nonemployee Share-Based Payment Accounting. In June 2018, the FASB issued this ASU to expand the scope of Topic 718, Compensation-Stock Compensation to include share-based payment awards to be issued to non-employees in exchange for acquiring goods and services. The ASU aligned the accounting for awards issued to non-employees to be similar to employee awards. This update became effective at the beginning of the Company’s 2019 fiscal year. The adoption of this ASU did not have a material impact on the Company’s condensed consolidated financial statements and disclosures. Recently Issued Accounting Pronouncements ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement. In August 2018, the FASB issued this ASU to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This update is effective at the beginning of the Company’s 2020 fiscal year. The Company does not believe the adoption of this new guidance will have a material impact on its consolidated financial statements and disclosures.

Summary of Significant Accounting Policies

Other than policies noted within Recent Accounting Pronouncements below, there have been no significant changes from the significant accounting policies disclosed in Note 2 of the “Notes to Consolidated Financial Statements” included in the Prospectus.

Use of Estimates

GAAP requires management to make certain estimates, judgments, and assumptions that affect reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, management evaluates these estimates and judgments. Actual results could differ from those estimates.

Key estimates relate primarily to determining the net realizable value and demand for inventory, useful lives associated with property and equipment, valuation allowances with respect to deferred tax assets, contingencies and the valuation and assumptions underlying share-based compensation. On an ongoing basis, management evaluates its estimates compared to historical experience and trends, which form the basis for making judgments about the carrying value of assets and liabilities.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

ASU 2016-02, Leases. In February 2016, the FASB issued this Accounting Standards Update (“ASU”) to provide a comprehensive lease accounting model that requires lessees to recognize lease liabilities and corresponding right-of-use assets for most leases. The new guidance also changes the definition of a lease and requires enhanced disclosures of pertinent quantitative and qualitative information about an entity’s leasing activities. The FASB subsequently issued ASU 2018-10 allowing entities to initially apply ASU 2016-02 at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. These ASUs became effective at the beginning of the Company’s 2019 fiscal year. The Company adopted this ASU by applying the new guidance to new and existing leases effective February 4, 2019, with no restatement of comparative periods. The Company elected the package of practical expedients, which permitted the Company to not reassess under the new standard its prior conclusions about lease identification, lease classification and initial direct costs. The Company also made an accounting policy election to not recognize right-of-use assets and lease liabilities arising from short-term leases on its condensed consolidated balance sheets. The adoption of this ASU did not result in a cumulative effect adjustment to accumulated deficit. Upon adoption, the Company recognized operating lease right-of-use assets of $162.8 million and operating lease liabilities of $193.6 million. The adoption of this new guidance did not have a material net impact on the Company’s condensed consolidated statements of operations or condensed consolidated statements of cash flows.

The Company has operating and finance lease agreements for its fulfillment and customer service centers, corporate offices, and certain equipment. The Company determines if an arrangement contains a lease at inception based on the ability to control a physically distinct asset. Operating and finance lease right-of-use assets are recorded in the condensed consolidated balance sheets based on the initial measurement of the lease liability as adjusted to include prepaid rent and initial direct costs less any lease incentives received. Lease liabilities are measured at the commencement date based on the present value of the lease payments over the lease term. Lease payments are generally fixed but may include provisions for future rent increases based on a market index. The Company separately accounts for lease and non-lease components within lease agreements; the non-lease components primarily relate to common area maintenance for real estate leases. The Company uses its incremental borrowing rate to present value the lease liability as key inputs to determine the interest rate implicit in the lease are not shared by lessors.

Operating lease expense is recorded on a straight-line basis over the lease term. Right-of-use assets and lease liabilities for short-term leases are not recognized in the condensed consolidated balance sheets. Payments for short-term leases are recognized in the condensed consolidated statements of operations on a straight-line basis over the lease term.

ASU 2018-07, Stock Compensation; Improvements to Nonemployee Share-Based Payment Accounting. In June 2018, the FASB issued this ASU to expand the scope of Topic 718, Compensation-Stock Compensation to include share-based payment awards to be issued to non-employees in exchange for acquiring goods and services. The ASU aligned the accounting for awards issued to non-employees to be similar to employee awards. This update became effective at the beginning of the Company’s 2019 fiscal year. The adoption of this ASU did not have a material impact on the Company’s condensed consolidated financial statements and disclosures.

Recently Issued Accounting Pronouncements

ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement. In August 2018, the FASB issued this ASU to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This update is effective at the beginning of the Company’s 2020 fiscal year. The Company does not believe the adoption of this new guidance will have a material impact on its consolidated financial statements and disclosures.